vfs/procfs: Add kqueue support

[dragonfly.git] / contrib / dialog / dialog.1

'\" t
.\" $Id: dialog.1,v 1.234 2022/07/28 08:13:25 tom Exp $
.\" Copyright 2005-2021,2022  Thomas E. Dickey
.\"
.\" This program is free software; you can redistribute it and/or modify
.\" it under the terms of the GNU Lesser General Public License, version 2.1
.\" as published by the Free Software Foundation.
.\"
.\" This program is distributed in the hope that it will be useful, but
.\" WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
.\" Lesser General Public License for more details.
.\"
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.\" License along with this program; if not, write to
.\"     Free Software Foundation, Inc.
.\"     51 Franklin St., Fifth Floor
.\"     Boston, MA 02110, USA.
.\"
.\" definitions for renaming
.ds p dialog
.ds l dialog
.ds L Dialog
.ds D DIALOG
.\"
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.ft CW
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.TH \*D 1 "" "$Date: 2022/07/28 08:13:25 $"
.SH NAME
dialog \- display dialog boxes from shell scripts
.SH SYNOPSIS
\fB\*p \-\-clear\fP
.br
.BI "\*p \-\-create\-rc " file
.br
\fB\*p \-\-print\-maxsize\fP
.br
\fB\*p\fP
\fIcommon-options\fP
\fIbox-options\fP
.SH DESCRIPTION
\fB\*L\fP
is a program that will let you present a variety of questions or
display messages using dialog boxes from a shell script.
These types of dialog boxes are implemented
(though not all are necessarily compiled into \fB\*p\fR):
.RS
.LP
.nh
.na
.BR buildlist ", "
.BR calendar ", "
.BR checklist ", "
.BR dselect ", "
.BR editbox ", "
.BR form ", "
.BR fselect ", "
.BR gauge ", "
.BR infobox ", "
.BR inputbox ", "
.BR inputmenu ", "
.BR menu ", "
.BR mixedform ", "
.BR mixedgauge ", "
.BR msgbox " (message), "
.BR passwordbox ", "
.BR passwordform ", "
.BR pause ", "
.BR prgbox ", "
.BR programbox ", "
.BR progressbox ", "
.BR radiolist ", "
.BR rangebox ", "
.BR tailbox ", "
.BR tailboxbg ", "
.BR textbox ", "
.BR timebox ", "
.BR treeview ", and "
.BR yesno " (yes/no)."
.ad
.RE
.PP
You can put more than one dialog box into a script:
.bP
Use the "\fB\-\-and\-widget\fP" token to force \fB\*p\fP to proceed to the next
dialog unless you have pressed ESC to cancel, or
.bP
Simply add the tokens for the next dialog box, making a chain.
\*L stops chaining when the return code from a dialog is nonzero,
e.g., Cancel or No (see DIAGNOSTICS).
.PP
Some widgets, e.g., checklist, will write text to \fB\*p\fP's output.
Normally that is the standard error, but there are options for
changing this:
\*(``\fB\-\-output\-fd\fP\*('',
\*(``\fB\-\-stderr\fP\*('' and
\*(``\fB\-\-stdout\fP\*(''.
No text is written if the Cancel button (or ESC) is pressed;
\fB\*p\fP exits immediately in that case.
.
.\" ************************************************************************
.SH OPTIONS
All options begin with \*(``\fB\-\-\fP\*(''
(two ASCII hyphens,
for the benefit of those using systems with deranged locale support).
.PP
A \*(``\fB\-\-\fP\*('' by itself is used as an escape,
i.e., the next token on the command-line is not treated as an option.
This is different from \fBgetopt\fP(1), 
which uses that token to treat the remaining tokens as \fIparameters\fP
rather than \fIoptions\fP.
.RS
.PP
.B \*p \-\-title \-\- \-\-Not an option
.br
.B \*p \-\-title This \-\- \-\-title is not an option
.RE
.PP
\fB\*L\fP
uses no \fIparameters\fP,
and uses its own \fIoptions\fP parser.
.PP
When a common (e.g., non-widget) option is repeated,
the last found is the one that is used.
Boolean options are handled specially so they can be cancelled,
by adding (or omitting) a \*(``no\*('' modifier
after the leading \*(``\fB\-\-\fP\*(''.
For instance, \fB\-\-no\-shadow\fP is documented here,
but \fB\-\-shadow\fP also is accepted.
.PP
The \*(``\fB\-\-args\fP\*('' option tells \fB\*p\fP to list the command-line
parameters to the standard error.
This is useful when debugging complex scripts using
the \*(``\fB\-\-\fP\*('' and \*(``\fB\-\-file\fP\*('',
since the command-line may be rewritten as these are expanded.
.PP
The \*(``\fB\-\-file\fP\*('' option tells \fB\*p\fP to read parameters from
the file named as its value.
.RS
.B \*p \-\-file \fIparameterfile
.RE
.PP
Blanks not within double-quotes are discarded
(use backslashes to quote single characters).
The result is inserted into the command-line,
replacing \*(``\fB\-\-file\fP\*('' and its option value.
Interpretation of the command-line resumes from that point.
If \fIparameterfile\fP begins with \*(``&\*('', \fB\*p\fP
interprets the following text as a file descriptor number
rather than a filename.
.PP
Most widgets accept \fIheight\fP and \fIwidth\fP parameters,
which can be used to automatically size the widget to accommodate
multi-line message \fIprompt\fP values:
.bP
If the parameter is negative,
\fB\*l\fP uses the screen's size.
.bP
If the parameter is zero,
\fB\*l\fP uses minimum size for the widget to display the \fIprompt\fP
and data.
.bP
Otherwise, \fB\*l\fP uses the given size for the widget.
.
.SS \fBCommon Options\fP
Most of the common options are reset before processing each widget.
.
.IP "\fB\-\-ascii\-lines
Rather than draw graphics lines around boxes,
draw ASCII \*(``+\*('' and \*(``-\*('' in the same place.
See also \*(``\fB\-\-no\-lines\fR\*(''.
.
.IP "\fB\-\-aspect \fIratio"
This gives you some control over the box dimensions when using auto
sizing (specifying 0 for height and width).
It represents width / height.
The default is 9, which means 9 characters wide to every 1 line high.
.
.IP "\fB\-\-backtitle \fIbacktitle"
Specifies a
\fIbacktitle\fP
string to be displayed on the backdrop, at the top of the screen.
.
.IP "\fB\-\-begin \fIy x"
Specify the position of the upper left corner of a dialog box on the screen.
.
.IP "\fB\-\-cancel\-label \fIstring"
Override the label used for \*(``Cancel\*('' buttons.
.
.IP "\fB\-\-clear"
Clears the widget screen, keeping only the screen_color background.
Use this when you combine widgets
with \*(``\fB\-\-and\-widget\fR\*('' to erase the
contents of a previous widget on the screen, so it won't be seen
under the contents of a following widget.
Understand this as the complement of \*(``\fB\-\-keep\-window\fR\*(''.
To compare the effects, use these:
.
.ES
All three widgets visible, staircase effect, ordered 1,2,3:
.Ex
\*p \e
                               \-\-begin 2 2 \-\-yesno "" 0 0 \e
    \-\-and\-widget               \-\-begin 4 4 \-\-yesno "" 0 0 \e
    \-\-and\-widget               \-\-begin 6 6 \-\-yesno "" 0 0
.Ee
.
.ES
Only the last widget is left visible:
.Ex
\*p \e
                 \-\-clear       \-\-begin 2 2 \-\-yesno "" 0 0 \e
    \-\-and\-widget \-\-clear       \-\-begin 4 4 \-\-yesno "" 0 0 \e
    \-\-and\-widget               \-\-begin 6 6 \-\-yesno "" 0 0
.Ee
.
.ES
All three widgets visible, staircase effect, ordered 3,2,1:
.Ex
\*p \e
                 \-\-keep\-window \-\-begin 2 2 \-\-yesno "" 0 0 \e
    \-\-and\-widget \-\-keep\-window \-\-begin 4 4 \-\-yesno "" 0 0 \e
    \-\-and\-widget               \-\-begin 6 6 \-\-yesno "" 0 0
.Ee
.
.ES
First and third widget visible, staircase effect, ordered 3,1:
.Ex
\*p \e
                 \-\-keep\-window \-\-begin 2 2 \-\-yesno "" 0 0 \e
    \-\-and\-widget \-\-clear       \-\-begin 4 4 \-\-yesno "" 0 0 \e
    \-\-and\-widget               \-\-begin 6 6 \-\-yesno "" 0 0
.Ee
.IP
Note, if you want to restore original console colors and send your
cursor home after the dialog program has exited, use the \fBclear\fR(1)
command.
Conversely, if you want to clear the screen and send your cursor to
the lower left after the \fB\*p\fP program has exited, use the
\fB\-\-erase\-on\-exit\fR\ option.
.
.IP "\fB\-\-colors"
Interpret embedded \*(``\eZ\*('' sequences in the dialog text
by the following character,
which tells \fB\*p\fP to set colors or video attributes:
.RS
.bP
0 through 7 are the ANSI color numbers used in curses:
black,
red,
green,
yellow,
blue,
magenta,
cyan and
white respectively.
.bP
Bold is set by 'b', reset by 'B'.
.bP
Reverse is set by 'r', reset by 'R'.
.bP
Underline is set by 'u', reset by 'U'.
.bP
The settings are cumulative, e.g., \*(``\eZb\eZ1\*('' makes the following text
bold (perhaps bright) red.
.bP
Restore normal settings with \*(``\eZn\*(''.
.RE
.
.IP "\fB\-\-column\-separator \fIstring"
Tell \fB\*p\fP to split data for radio/checkboxes and menus on the
occurrences of the given string, and to align the split data into columns.
.
.IP "\fB\-\-cr\-wrap"
Interpret embedded newlines in the dialog text as a newline on the screen.
Otherwise, \fB\*p\fR will only wrap lines
where needed to fit inside the text box.
.IP
Even though you can control line breaks with this,
\fB\*L\fR will still wrap any lines that are too long for the width of the box.
Without cr-wrap, the layout of your text may be formatted to look nice
in the source code of your script without affecting the way it will
look in the dialog.
.IP
The \fIcr\-wrap\fP feature is implemented subject to these conditions:
.RS
.bP
the string contains \*(``\en\*('' and the \fB\-\-no\-nl\-expand\fP option is
not used, or
.bP
the \fB\-\-trim\fP option is used.
.RE
.IP
For more information, see \fBWhitespace Options\fP.
.
.IP "\fB\-\-create\-rc \fIfile"
When
\fB\*p\fP
supports run-time configuration,
this can be used to dump a sample configuration file to the file specified
by
.IR file "."
.
.IP "\fB\-\-cursor\-off\-label"
Place the terminal cursor at the end of a button instead of on the
first character of the button label.
This is useful to reduce visual confusion when the cursor coloration
interacts poorly with the button-label text colors.
.
.IP "\fB\-\-date\-format \fIformat"
If the host provides \fBstrftime\fP,
this option allows you to specify the format of the date printed for
the \fB\-\-calendar\fP widget.
The time of day (hour, minute, second) are the current local time.
.
.IP "\fB\-\-defaultno"
Make the default value of the
\fByes/no\fP
box a
.BR No .
Likewise, treat the default button of widgets that provide
\*(``OK\*('' and \*(``Cancel\*(''
as a \fICancel\fP.
If \*(``\fB\-\-no\-cancel\fP\*('' or \*(``\fB\-\-visit\-items\fP\*('' are given
those options overrides this,
making the default button always \*(``Yes\*(''
(internally the same as \*(``OK\*('').
.
.IP "\fB\-\-default\-button \fIstring"
Set the default (preselected) button in a widget.
By preselecting a button,
a script makes it possible for the user to simply press \fIEnter\fP
to proceed through a dialog with minimum interaction.
.IP
The option's value is the name of the button:
.IR ok ,
.IR yes ,
.IR cancel ,
.IR no ,
.IR help "\ or"
.IR extra .
.IP
Normally the first button in each widget is the default.
The first button shown is determined by the widget
together with the \*(``\fB\-\-no\-ok\fP\*(''
and \*(``\fB\-\-no\-cancel\fP\*('' options.
If this option is not given, there is no default button assigned.
.
.IP "\fB\-\-default\-item \fIstring"
Set the default item in a checklist, form or menu box.
Normally the first item in the box is the default.
.
.IP "\fB\-\-erase\-on\-exit"
When \fB\*p\fP exits, remove the dialog widget, erasing the entire
screen to its native background color, and place the terminal cursor
at the lower left corner.
.
.IP "\fB\-\-exit\-label \fIstring"
Override the label used for \*(``EXIT\*('' buttons.
.
.IP "\fB\-\-extra\-button"
Show an extra button, between \*(``OK\*('' and \*(``Cancel\*('' buttons.
.IP
The extra button appears between \*(``Yes\*('' and \*(``No\*(''
for the \fIyesno\fP widget.
.
.IP "\fB\-\-extra\-label \fIstring"
Override the label used for \*(``Extra\*('' buttons.
Note: for inputmenu widgets, this defaults to \*(``Rename\*(''.
.
.IP "\fB\-\-help"
Prints the help message to the standard output and exits.
The help message is also printed if no options are given,
or if an unrecognized option is given.
.
.IP "\fB\-\-help\-button"
Show a help-button after \*(``OK\*('' and \*(``Cancel\*('' buttons
in boxes which have a list of tagged items
(i.e., checklist, radiolist, menu, and treeview boxes).
.IP
The help-button appears after \*(``Yes\*('' and \*(``No\*(''
for the \fIyesno\fP widget.
.IP
On exit, the return status indicates that the Help button was pressed.
\fB\*L\fP also writes a message to its output
after the token \*(``HELP\*('':
.RS
.bP
If "\fB\-\-item\-help\fR" is also given, the item-help text is written.
.bP
Otherwise, the item's tag (the first field) is written.
.RE
.IP
.IP
You can use the \fB\-\-help\-tags\fP option and/or set the DIALOG_ITEM_HELP
environment variable to modify these messages and exit-status.
.IP
This option can be applied to other widgets,
which have an \*(``OK\*('' button,
whether or not the \*(``Cancel\*('' button is used.
The return status and output are not treated specially for the other widgets;
the help-button is just an extra button.
.
.IP "\fB\-\-help\-label \fIstring"
Override the label used for \*(``Help\*('' buttons.
.
.IP "\fB\-\-help\-status"
If the help-button is selected,
writes the checklist, radiolist or form information
after the item-help \*(``HELP\*('' information.
This can be used to reconstruct the state of a checklist after processing
the help request.
.
.IP "\fB\-\-help\-tags"
Modify the messages written on exit for \fB\-\-help\-button\fP
by making them always just the item's tag.
This does not affect the exit status code.
.
.IP "\fB\-\-hfile \fIfilename"
Display the given file using a textbox when the user presses F1.
.
.IP "\fB\-\-hline \fIstring"
Display the given string centered at the bottom of the widget.
.
.IP "\fB\-\-ignore"
Ignore options that \fB\*p\fP does not recognize.
Some well-known ones such as \*(``\fB\-\-icon\fP\*('' are ignored anyway,
but this is a better choice for compatibility with other implementations.
.
.IP "\fB\-\-input\-fd \fIfd"
Read keyboard input from the given file descriptor.
Most \fB\*p\fR scripts read from the standard input,
but the gauge widget reads a pipe (which is always standard input).
Some configurations do not work properly when
\fB\*p\fP tries to reopen the terminal.
Use this option (with appropriate juggling of file-descriptors)
if your script must work in that type of environment.
.
.IP "\fB\-\-insecure"
Makes the password widget friendlier but less secure,
by echoing asterisks for each character.
.
.IP "\fB\-\-iso\-week"
Set the starting point for the week-number
shown in the \*(``\fB\-\-calendar\fP\*('' option
according to ISO-8601, which starts numbering
with the first week which includes a Thursday in January.
.
.IP "\fB\-\-item\-help"
Interpret the tags data for checklist, radiolist and menu boxes
adding a column which is displayed in the bottom line of the
screen, for the currently selected item.
.
.IP "\fB\-\-keep\-tite"
When built with \fBncurses\fP,
\fB\*p\fP normally checks to see if it is running in an \fBxterm\fP,
and in that case tries to suppress the initialization strings that
would make it switch to the alternate screen.
Switching between the normal and alternate screens
is visually distracting in a script which runs \fB\*p\fP
several times.
Use this option to allow \fB\*p\fP to use those initialization strings.
.
.IP "\fB\-\-keep\-window"
Normally when \fB\*p\fR performs several \fBtailboxbg\fR widgets
connected by \*(``\fB\-\-and\-widget\fR\*('',
it clears the old widget from the screen by painting over it.
Use this option to suppress that repainting.
.IP
At exit, \fB\*p\fR repaints all of the widgets which have been
marked with \*(``\fB\-\-keep\-window\fR\*('',
even if they are not \fBtailboxbg\fR widgets.
That causes them to be repainted in reverse order.
See the discussion of the \*(``\fB\-\-clear\fR\*('' option for examples.
.
.IP "\fB\-\-last\-key"
At exit, report the last key which the user entered.
This is the curses key code rather than a symbol or literal character,
and is only reported for keys which are bound to an action.
It can be used by scripts to distinguish between two keys which are
bound to the same action.
.
.IP "\fB\-\-max\-input \fIsize"
Limit input strings to the given size.
If not specified, the limit is 2048.
.
.IP "\fB\-\-no\-cancel"
Suppress the \*(``Cancel\*('' button in checklist, inputbox and menu box modes.
A script can still test if the user pressed the ESC key to cancel to quit.
.
.IP "\fB\-\-no\-collapse"
Normally \fB\*p\fR converts tabs to spaces and reduces multiple
spaces to a single space for text which is displayed in a message boxes, etc.
Use this option to disable that feature.
Note that \fB\*p\fR will still wrap text,
subject to the \*(``\fB\-\-cr\-wrap\fR\*(''
and \*(``\fB\-\-trim\fR\*('' options.
.IP
The \fIno\-collapse\fP feature is implemented subject to these conditions:
.RS
.bP
the string contains \*(``\en\*('' and the \fB\-\-no\-nl\-expand\fP option is
not used, or
.bP
the \fB\-\-trim\fP option is not used.
.RE
.IP
For more information, see \fBWhitespace Options\fP.
.
.IP "\fB\-\-no\-hot\-list"
Tells
\fB\*p\fP
to suppress the hotkey feature for lists, e.g., the checkbox, menus.
.IP
Normally, the first uppercase character of a list entry will be highlighted,
and typing that character will move the focus to that entry.
This option suppresses both the highlighting and the movement.
.IP
Hotkeys for buttons (\*(``OK\*('' , \*(``Cancel\*('', etc.) are unaffected.
.
.IP "\fB\-\-no\-items"
Some widgets (checklist, inputmenu, radiolist, menu) display a list
with two columns (a \*(``tag\*('' and \*(``item\*('',
i.e., \*(``description\*('').
This option tells \fB\*p\fP to read shorter rows,
omitting the \*(``item\*('' part of the list.
This is occasionally useful, e.g., if the tags provide enough information.
.IP
See also \fB\-\-no\-tags\fP.
If both options are given, this one is ignored.
.
.IP "\fB\-\-no\-kill"
Tells
\fB\*p\fP
to put the
\fBtailboxbg\fP
box in the background,
printing its process id to \fB\*p\fP's output.
SIGHUP is disabled for the background process.
.
.IP "\fB\-\-no-label \fIstring"
Override the label used for \*(``No\*('' buttons.
.
.IP "\fB\-\-no\-lines
Rather than draw lines around boxes, draw spaces in the same place.
See also \*(``\fB\-\-ascii\-lines\fR\*(''.
.
.IP "\fB\-\-no\-mouse
Do not enable the mouse.
.
.IP "\fB\-\-no\-nl\-expand
Do not convert \*(``\en\*('' substrings of the message/prompt text into
literal newlines.
.IP
The \fIno\-nl\-expand\fP feature is used only if
the string contains \*(``\en\*('' so that there is something to convert.
.IP
For more information, see \fBWhitespace Options\fP.
.
.IP "\fB\-\-no\-ok"
Suppress the \*(``OK\*('' button, so that it is not displayed.
A script can still test if the user pressed
the \*(``Enter\*('' key to accept the data:
.RS
.bP
The \*(``Enter\*('' key is always handled as the \*(``OK\*('' button
when the \fB\-\-no\-ok\fP option is used.
That is, by default it is bound to the \fILEAVE\fP virtual key.
.IP
When \fB\-\-no\-ok\fP is not used,
you can use the the \fITab\fP key to move the cursor through the
fields and buttons on the widget.
In that case, the \*(``Enter\*('' key activates the current button
if the cursor is positioned on a button.
.bP
To provide for the case where you want to activate a button
when using \fB\-\-no\-ok\fP,
there is another virtual key \fILEAVE\fP,
which activates the current button.
By default, \fB^D\fP (EOF) is bound to that key.
.RE
.
.IP "\fB\-\-no\-shadow"
Suppress shadows that would be drawn to the right and bottom of each dialog box.
.
.IP "\fB\-\-no\-tags"
Some widgets (checklist, inputmenu, radiolist, menu) display a list
with two columns (a \*(``tag\*('' and \*(``description\*('').
The tag is useful for scripting, but may not help the user.
The \fB\-\-no\-tags\fP option (from Xdialog) may be used to suppress the
column of tags from the display.
Unlike the \fB\-\-no\-items\fP option,
this does not affect the data which is read from the script.
.IP
Xdialog does not display the tag column for the analogous buildlist
and treeview widgets; \fB\*p\fP does the same.
.IP
Normally \fB\*p\fP allows you to quickly move to entries on the displayed list,
by matching a single character to the first character of the tag.
When the \fB\-\-no\-tags\fP option is given, \fB\*p\fP matches against
the first character of the description.
In either case, the matchable character is highlighted.
.
.IP "\fB\-\-ok\-label \fIstring"
Override the label used for \*(``OK\*('' buttons.
.
.IP "\fB\-\-output\-fd \fIfd"
Direct output to the given file descriptor.
Most \fB\*p\fR scripts write to the standard error,
but error messages may also be written there, depending on your script.
.
.IP "\fB\-\-separator \fIstring"
.IP "\fB\-\-output\-separator \fIstring"
Specify a string that will separate the output on \fB\*p\fP's output from
checklists, rather than a newline (for \fB\-\-separate\-output\fP) or a space.
This applies to other widgets such as forms and editboxes which normally
use a newline.
.
.IP "\fB\-\-print\-maxsize"
Print the maximum size of dialog boxes, i.e., the screen size,
to \fB\*p\fP's output.
This may be used alone, without other options.
.
.IP "\fB\-\-print\-size"
Prints the size of each dialog box to \fB\*p\fP's output
when the box is initialized.
.
.IP "\fB\-\-print\-text\-only \fIstring [ height [ width ] ]"
Prints the string as it would be wrapped in a message box
to \fB\*p\fP's output.
.IP
Because the optional \fIheight\fP and \fIwidth\fP default to zero,
if they are omitted, \fB\*p\fP autosizes according to the screen dimensions.
.
.IP "\fB\-\-print\-text\-size \fIstring [ height [ width ] ]"
Prints the size of the string as it would be wrapped in a message box,
to \fB\*p\fP's output,
as
.Ex
height width
.Ee
.IP
Because the optional \fIheight\fP and \fIwidth\fP parameters default to zero,
if they are omitted, \fB\*p\fP autosizes according to the screen dimensions.
.
.IP "\fB\-\-print\-version"
Prints \fB\*p\fR's version to \fB\*p\fP's output.
This may be used alone, without other options.
It does not cause \fB\*l\fP to exit by itself.
.
.IP "\fB\-\-quoted"
Normally \fB\*p\fP quotes the strings returned by checklist's
as well as the item-help text.
Use this option to quote all string results as needed
(i.e., if the string contains whitespace or a single or double-quote character).
.
.IP "\fB\-\-reorder"
By default, the buildlist widget uses the same order for the output (right)
list as for the input (left).
Use this option to tell \fB\*p\fP to use the order
in which a user adds selections to the output list.
.
.IP "\fB\-\-scrollbar"
For widgets holding a scrollable set of data,
draw a scrollbar on its right-margin.
This does not respond to the mouse.
.
.IP "\fB\-\-separate\-output"
For certain widgets (buildlist, checklist, treeview),
output result one line at a time, with no quoting.
This facilitates parsing by another program.
.
.IP "\fB\-\-separate\-widget \fIstring"
Specify a string that will separate the output on \fB\*p\fP's output from
each widget.
This is used to simplify parsing the result of a dialog with several widgets.
If this option is not given,
the default separator string is a tab character.
.
.IP "\fB\-\-single\-quoted"
Use single-quoting as needed (and no quotes if unneeded) for the
output of checklist's as well as the item-help text.
.IP
If this option is not set, \fB\*p\fP may use double quotes around each item.
In either case,
\fB\*p\fP adds backslashes to make the output useful in shell scripts.
.IP
Single quotes would be needed if
the string contains whitespace or a single or double-quote character.
.
.IP "\fB\-\-size\-err"
Check the resulting size of a dialog box before trying to use it,
printing the resulting size if it is larger than the screen.
(This option is obsolete, since all new-window calls are checked).
.
.IP "\fB\-\-sleep \fIsecs"
Sleep (delay) for the given number of seconds after processing a dialog box.
.
.IP "\fB\-\-stderr"
Direct output to the standard error.
This is the default, since curses normally writes screen updates to
the standard output.
.
.IP "\fB\-\-stdout"
Direct output to the standard output.
This option is provided for compatibility with Xdialog,
however using it in portable scripts is not recommended,
since curses normally writes its screen updates to the standard output.
If you use this option, \fB\*p\fR attempts to reopen the terminal
so it can write to the display.
Depending on the platform and your environment, that may fail.
.
.IP "\fB\-\-tab\-correct"
Convert each tab character to one or more spaces
(for the \fBtextbox\fP widget; otherwise to a single space).
Otherwise, tabs are rendered according to the curses library's interpretation.
The \fB\-\-no\-collapse\fP option disables tab expansion.
.
.IP "\fB\-\-tab\-len \fIn"
Specify the number of spaces that a tab character occupies if the
\*(``\fB\-\-tab\-correct\fP\*('' option is given.
The default is 8.
This option is only effective for the \fBtextbox\fP widget.
.
.IP "\fB\-\-time\-format \fIformat"
If the host provides \fBstrftime\fP,
this option allows you to specify the format of the time printed for
the \fB\-\-timebox\fP widget.
The day, month, year values in this case are for the current local time.
.
.IP "\fB\-\-timeout \fIsecs"
Timeout if no user response within the given number of seconds.
A timeout of zero seconds is ignored.
.IP
Normally a timeout causes an ESC character to be entered in the current widget,
cancelling it.
Other widgets may still be on the screen;
these are not cancelled.
Set the \fBDIALOG_TIMEOUT\fP environment variable to tell \fB\*l\fP to
directly exit instead, i.e., cancelling all widgets on the screen.
.IP
This option is ignored by the \*(``\fB\-\-pause\fP\*('' widget.
It is also overridden
if the background \*(``\fB\-\-tailboxbg\fP\*('' option is used
to set up multiple concurrent widgets.
.
.IP "\fB\-\-title \fItitle"
Specifies a
\fItitle\fP
string to be displayed at the top of the dialog box.
.
.IP "\fB\-\-trace \fIfilename"
logs the command-line parameters,
keystrokes and other information to the given file.
If \fB\*l\fP reads a configure file, it is logged as well.
Piped input to the \fIgauge\fP widget is logged.
Use control/T to log a picture of the current dialog window.
.IP
The \fB\*p\fR program handles some command-line parameters specially,
and removes them from the parameter list as they are processed.
For example, if the first option is \fB\-\-trace\fP,
then that is processed (and removed) before \fB\*p\fR initializes the display.
.
.IP "\fB\-\-week\-start \fIday"
sets the starting day for the week,
used in the \*(``\fB\-\-calendar\fP\*('' option.
The \fIday\fP parameter can be
.RS
.bP
a number (0 to 6, Sunday through Saturday using POSIX) or
.bP
the special value \*(``locale\*('' (this works with systems using glibc,
providing an extension to the \fBlocale\fP command,
the \fBfirst_weekday\fP value).
.bP
a string matching one of the abbreviations for the day of the week
shown in the \fBcalendar\fP widget, e.g., \*(``Mo\*('' for \*(``Monday\*(''.
.RE
.
.IP "\fB\-\-trim"
eliminate leading blanks,
trim literal newlines and repeated blanks from message text.
.IP
The \fItrim\fP feature is implemented subject to these conditions:
.RS
.bP
the string does not contain \*(``\en\*('' or
.bP
the \fB\-\-no\-nl\-expand\fP option is used.
.RE
.IP
For more information, see \fBWhitespace Options\fP.
.
.IP
See also the \*(``\fB\-\-cr\-wrap\fR\*(''
and \*(``\fB\-\-no\-collapse\fR\*('' options.
.
.IP "\fB\-\-version"
Prints \fB\*p\fR's version to the standard output, and exits.
See also \*(``\fB\-\-print\-version\fP\*(''.
.
.IP "\fB\-\-visit\-items"
Modify the tab-traversal of checklist, radiolist, menubox and inputmenu
to include the list of items as one of the states.
This is useful as a visual aid,
i.e., the cursor position helps some users.
.IP
When this option is given, the cursor is initially placed on the list.
Abbreviations (the first letter of the tag) apply to the list items.
If you tab to the button row, abbreviations apply to the buttons.
.
.IP "\fB\-\-yes-label \fIstring"
Override the label used for \*(``Yes\*('' buttons.
.
.\" ************************************************************************
.SS Box Options
All dialog boxes have at least three parameters:
.TP 7
\fItext\fP
the caption or contents of the box.
.TP 7
\fIheight\fP
the height of the dialog box.
.TP 7
\fIwidth\fP
the width of the dialog box.
.PP
Other parameters depend on the box type.
.
.
.IP "\fB\-\-buildlist \fItext height width list-height \fR[ \fItag item status \fR] \fI..."
A \fBbuildlist\fP dialog displays two lists, side-by-side.
The list on the left shows unselected items.
The list on the right shows selected items.
As items are selected or unselected, they move between the lists.
.IP
Use a carriage return or the \*(``OK\*('' button to accept the current value
in the selected-window and exit.
The results are written using the order displayed in the selected-window.
.IP
The initial on/off state of each entry is specified by
.IR status "."
.IP
The dialog behaves like a \fBmenu\fP, using the \fB\-\-visit\-items\fP
to control whether the cursor is allowed to visit the lists directly.
.RS
.bP
If \fB\-\-visit\-items\fP is not given,
tab-traversal uses two states (OK/Cancel).
.bP
If \fB\-\-visit\-items\fP is given,
tab-traversal uses four states (Left/Right/OK/Cancel).
.RE
.IP
Whether or not \fB\-\-visit\-items\fP is given,
it is possible to move the highlight between the two lists using
the default \*(``^\*('' (left-column) and \*(``$\*('' (right-column) keys.
.IP
On exit, a list of the \fItag\fP
strings of those entries that are turned on
will be printed on \fB\*p\fP's output.
.IP
If the "\fB\-\-separate\-output\fP" option is not given,
the strings will be quoted as needed
to make it simple for scripts to separate them.
By default, this uses double-quotes, as needed.
See the \*(``\fB\-\-single\-quoted\fP\*('' option,
which modifies the quoting behavior.
.
.IP "\fB\-\-calendar \fItext height width day month year"
A \fBcalendar\fP box displays
month, day and year in separately adjustable windows.
If the values for day, month or year are missing or negative,
the current date's corresponding values are used.
You can increment or decrement any of those using the
left-, up-, right-, and down-arrows.
Use vi-style h, j, k and l for moving around the array of days in a month.
Use tab or backtab to move between windows.
If the year is given as zero, the current date is used as an initial value.
.IP
On exit, the date is printed in the form day/month/year.
The format can be overridden using the \fB\-\-date\-format\fP option.
.
.IP "\fB\-\-checklist \fItext height width list-height \fR[ \fItag item status \fR] \fI..."
A \fBchecklist\fP box is similar to a \fBmenu\fP box;
there are multiple entries presented in the form of a menu.
Another difference is
that you can indicate which entry is currently selected, by setting its
.IR status " to " on "."
Instead of choosing
one entry among the entries, each entry can be turned on or off by the user.
The initial on/off state of each entry is specified by
.IR status "."
.IP
On exit, a list of the \fItag\fP
strings of those entries that are turned on
will be printed on \fB\*p\fP's output.
.IP
If the \*(``\fB\-\-separate\-output\fP\*('' option is not given,
the strings will be quoted as needed
to make it simple for scripts to separate them.
By default, this uses double-quotes (as needed).
See the \*(``\fB\-\-single\-quoted\fP\*('' option,
which modifies the quoting behavior.
.
.IP "\fB\-\-dselect \fIfilepath height width\fR"
The directory-selection dialog displays a text-entry window
in which you can type a directory,
and above that a windows with directory names.
.IP
Here
\fBfilepath\fP
can be a filepath in which case the directory window
will display the contents of the path and the text-entry window will contain
the preselected directory.
.IP
Use tab or arrow keys to move between the windows.
Within the directory window, use the up/down arrow keys
to scroll the current selection.
Use the space-bar to copy the current selection into the text-entry
window.
.IP
Typing any printable characters switches focus to the text-entry window,
entering that character as well as scrolling the directory
window to the closest match.
.IP
Use a carriage return or the \*(``OK\*('' button to accept the current value
in the text-entry window and exit.
.IP
On exit, the contents of the text-entry window are written
to \fB\*p\fP's output.
.
.IP "\fB\-\-editbox \fIfilepath height width\fR"
The edit-box dialog displays a copy of the file.
You may edit it using
the \fIbackspace\fP, \fIdelete\fP and cursor keys
to correct typing errors.
It also recognizes pageup/pagedown.
Unlike the \fB\-\-inputbox\fP,
you must tab to the \*(``OK\*('' or \*(``Cancel\*('' buttons
to close the dialog.
Pressing the \*(``Enter\*('' key within the box will split
the corresponding line.
.IP
On exit, the contents of the edit window are written to \fB\*p\fP's output.
.
.nf
.IP "\fB\-\-form \fItext height width formheight \fR[ \fIlabel y x item y x flen ilen \fR] \fI..."
.fi
The \fBform\fP dialog displays a form consisting of labels and fields,
which are positioned on a scrollable window by coordinates given in the script.
The field length \fIflen\fR and input-length \fIilen\fR tell how long
the field can be.
The former defines the length shown for a selected field,
while the latter defines the permissible length of the data entered in the
field.
.RS
.bP
If \fIflen\fR is zero, the corresponding field cannot be altered.
and the contents of the field determine the displayed-length.
.bP
If \fIflen\fR is negative, the corresponding field cannot be altered,
and the negated value of \fIflen\fR is used as the displayed-length.
.bP
If \fIilen\fR is zero, it is set to \fIflen\fR.
.RE
.IP
Use up/down arrows (or control/N, control/P) to move between fields.
Use tab to move between windows.
.IP
On exit, the contents of the form-fields are written to \fB\*p\fP's output,
each field separated by a newline.
The text used to fill non-editable fields
(\fIflen\fR is zero or negative)
is not written out.
.
.
.IP "\fB\-\-fselect \fIfilepath height width\fR"
The \fBfselect\fP (file-selection) dialog displays a text-entry window
in which you can type a filename (or directory),
and above that two windows with directory names and filenames.
.IP
Here
\fBfilepath\fP
can be a filepath in which case the file and directory windows
will display the contents of the path and the text-entry window will contain
the preselected filename.
.IP
Use tab or arrow keys to move between the windows.
Within the directory or filename windows, use the up/down arrow keys
to scroll the current selection.
Use the space-bar to copy the current selection into the text-entry
window.
.IP
Typing any printable characters switches focus to the text-entry window,
entering that character as well as scrolling the directory and filename
windows to the closest match.
.IP
Typing the space character forces \fB\*p\fP to complete the current
name (up to the point where there may be a match against more than one
entry).
.IP
Use a carriage return or the \*(``OK\*('' button to accept the current value
in the text-entry window and exit.
.IP
On exit, the contents of the text-entry window are written
to \fB\*p\fP's output.
.
.
.IP "\fB\-\-gauge \fItext height width [percent]\fR"
A
\fBgauge\fP
box displays a meter along the bottom of the box.
The meter indicates the percentage.
New percentages are read from
standard input, one integer per line.
The meter is updated
to reflect each new percentage.
If the standard input reads the string \*(``XXX\*('',
then the first line following is taken as an integer percentage,
then subsequent lines up to another \*(``XXX\*('' are used for a new prompt.
The gauge exits when EOF is reached on the standard input.
.IP
The \fIpercent\fR value denotes the initial percentage shown in the meter.
If not specified, it is zero.
.IP
On exit, no text is written to \fB\*p\fP's output.
The widget accepts no input, so the exit status is always OK.
.
.
.IP "\fB\-\-infobox \fItext height width"
An \fBinfo\fP box is basically a \fBmessage\fP box.
However, in this case, \fB\*p\fP
will exit immediately after displaying the message to the user.
The screen is not cleared when \fB\*p\fP
exits, so that the message will remain on the screen until the calling
shell script clears it later.
This is useful when you want to inform
the user that some operations are carrying on that may require some
time to finish.
.IP
On exit, no text is written to \fB\*p\fP's output.
An OK exit status is returned.
.
.
.IP "\fB\-\-inputbox \fItext height width [init]"
An
\fBinput\fP
box is useful when you want to ask questions that
require the user to input a string as the answer.
If init is supplied
it is used to initialize the input string.
When entering the string,
the \fIbackspace\fP, \fIdelete\fP and cursor keys
can be used to correct typing errors.
If the input string is longer than
can fit in the dialog box, the input field will be scrolled.
.IP
On exit, the input string will be printed on \fB\*p\fP's output.
.
.
.IP "\fB\-\-inputmenu \fItext height width menu-height \fR[ \fItag item \fR] \fI..."
An \fBinputmenu\fP box is very similar to an ordinary \fBmenu\fP box.
There are only a few differences between them:
.RS
.TP 4
1.
The entries are not automatically centered but left adjusted.
.TP
2.
An extra button (called \fIRename\/\fP) is implied to rename
the current item when it is pressed.
.TP
3.
It is possible to rename the current entry by pressing the
\fIRename\fP
button.
Then \fB\*p\fP will write the following on \fB\*p\fP's output.
.IP
RENAMED <tag> <item>
.RE
.
.
.IP "\fB\-\-menu \fItext height width menu-height \fR[ \fItag item \fR] \fI..."
As its name suggests, a
\fBmenu\fP
box is a dialog box that can be used to present a list of choices in
the form of a menu for the user to choose.
Choices are displayed in the order given.
Each menu entry consists of a \fItag\fP string and an \fIitem\fP string.
The \fItag\fP
gives the entry a name to distinguish it from the other entries in the
menu.
The \fIitem\fP is a short description of the option that the entry represents.
The user can move between the menu entries by pressing the
cursor keys, the first letter of the \fItag\fP
as a hot-key, or the number keys \fI1\fP through \fI9\fP.
There are \fImenu-height\fP
entries displayed in the menu at one time, but the menu will be
scrolled if there are more entries than that.
.IP
On exit the \fItag\fP
of the chosen menu entry will be printed on \fB\*p\fP's output.
If the \*(``\fB\-\-help\-button\fR\*('' option is given, the corresponding help
text will be printed if the user selects the help button.
.
.nf
.IP "\fB\-\-mixedform \fItext height width formheight \fR[ \fIlabel y x item y x flen ilen itype \fR] \fI..."
.fi
The \fBmixedform\fP dialog displays a form consisting of labels and fields,
much like the \fB\-\-form\fP dialog.
It differs by adding a field-type parameter to each field's description.
Each bit in the type denotes an attribute of the field:
.RS
.TP 5
1
hidden, e.g., a password field.
.TP 5
2
readonly, e.g., a label.
.RE
.
.IP "\fB\-\-mixedgauge \fItext height width percent \fR[ \fItag1 item1 \fR] \fI..."
A \fBmixedgauge\fP box displays a meter along the bottom of the box.
The meter indicates the percentage.
.IP
It also displays a list of the \fItag\/\fP- and \fIitem\/\fP-values at the
top of the box.
See \*l(3) for the tag values.
.IP
The \fItext\fP is shown as a caption between the list and meter.
The \fIpercent\fR value denotes the initial percentage shown in the meter.
.IP
No provision is made for reading data from the standard input as \fB\-\-gauge\fP
does.
.IP
On exit, no text is written to \fB\*p\fP's output.
The widget accepts no input, so the exit status is always OK.
.
.IP "\fB\-\-msgbox \fItext height width"
A \fBmessage\fP box is very similar to a \fByes/no\fP box.
The only difference between a \fBmessage\fP box and a \fByes/no\fP
box is that a \fBmessage\fP box has only a single \fBOK\fP button.
You can use this dialog box to display any message you like.
After reading the message, the user can press the \fIENTER\fP key so that
\fB\*p\fP will exit and the calling shell script can continue its operation.
.IP
If the message is too large for the space,
\fB\*p\fP may allow you to scroll it,
provided that the underlying curses implementation is capable enough.
In this case, a percentage is shown in the base of the widget.
.IP
On exit, no text is written to \fB\*p\fP's output.
Only an \*(``OK\*('' button is provided for input,
but an ESC exit status may be returned.
.
.IP "\fB\-\-pause \fItext height width seconds\fR"
A
\fBpause\fP
box displays a meter along the bottom of the box.
The meter indicates how many seconds remain until the end of the pause.
The pause exits when timeout is reached
or the user presses the OK button
(status OK)
or the user presses the CANCEL button
or Esc key.
.IP "\fB\-\-passwordbox \fItext height width [init]"
A \fBpassword\fP box is similar to an input box,
except that the text the user enters is not displayed.
This is useful when prompting for passwords or other
sensitive information.
Be aware that if anything is passed in \*(``init\*('', it
will be visible in the system's process table to casual snoopers.
Also, it
is very confusing to the user to provide them with a default password they
cannot see.
For these reasons, using \*(``init\*('' is highly discouraged.
See \*(``\fB\-\-insecure\fP\*('' if you do not care about your password.
.IP
On exit, the input string will be printed on \fB\*p\fP's output.
.
.
.nf
.IP "\fB\-\-passwordform \fItext height width formheight \fR[ \fIlabel y x item y x flen ilen \fR] \fI..."
.fi
This is identical to \fB\-\-form\fP except that all text fields are
treated as \fBpassword\fP widgets rather than \fBinputbox\fP widgets.
.
.
.IP "\fB\-\-prgbox \fItext command height width"
.IP "\fB\-\-prgbox \fIcommand height width"
A \fBprgbox\fP is very similar to a \fBprogrambox\fP.
.IP
This dialog box is used to display the output of a command that is
specified as an argument to \fBprgbox\fP.
.IP
After the command completes, the user can press the \fIENTER\fP key so that
\fB\*l\fP will exit and the calling shell script can continue its operation.
.IP
If four parameters are given, it displays the text under the title,
delineated from the scrolling file's contents.
If only three parameters are given, this text is omitted.
.
.
.IP "\fB\-\-programbox \fItext height width"
.IP "\fB\-\-programbox \fIheight width"
A \fBprogrambox\fP is very similar to a \fBprogressbox\fP.
The only difference between a \fBprogram\fP box and a \fBprogress\fP
box is that a \fBprogram\fP box displays an \fBOK\fP button
(but only after the command completes).
.IP
This dialog box is used to display the piped output of a command.
After the command completes, the user can press the \fIENTER\fP key so that
\fB\*l\fP will exit and the calling shell script can continue its operation.
.IP
If three parameters are given, it displays the text under the title,
delineated from the scrolling file's contents.
If only two parameters are given, this text is omitted.
.
.
.IP "\fB\-\-progressbox \fItext height width"
.IP "\fB\-\-progressbox \fIheight width"
A \fBprogressbox\fP is similar to an \fBtailbox\fP,
except that
.RS
.TP 3
a) rather than displaying the contents of a file,
it displays the piped output of a command and
.TP 3
b) it will exit when it reaches the end of the file
(there is no \*(``OK\*('' button).
.RE
.IP
If three parameters are given, it displays the text under the title,
delineated from the scrolling file's contents.
If only two parameters are given, this text is omitted.
.
.
.IP "\fB\-\-radiolist \fItext height width list-height \fR [ \fItag item status \fR] \fI..."
A \fBradiolist\fP box is similar to a \fBmenu\fP box.
The only difference is
that you can indicate which entry is currently selected, by setting its
.IR status " to " on "."
.IP
On exit, the tag of the selected item is written to \fB\*p\fP's output.
.
.
.nf
.IP "\fB\-\-rangebox \fItext height width min-value max-value default-value"
.fi
Allow the user to select from a range of values, e.g., using a slider.
The dialog shows the current value as a bar (like the gauge dialog).
Tabs or arrow keys move the cursor between the buttons and the value.
When the cursor is on the value,
you can edit it by:
.RS
.TP 5
left/right cursor movement to select a digit to modify
.TP 5
+/-
characters to increment/decrement the digit by one
.TP 5
0 through 9
to set the digit to the given value
.RE
.IP
Some keys are also recognized in all cursor positions:
.RS
.TP 5
home/end
set the value to its maximum or minimum
.TP 5
pageup/pagedown
increment the value so that the slider moves by one column
.RE
.
.
.IP "\fB\-\-tailbox \fIfile height width"
Display text from a file in a dialog box,
as in a \*(``tail -f\*('' command.
Scroll left/right using vi-style 'h' and 'l', or arrow-keys.
A '0' resets the scrolling.
.IP
On exit, no text is written to \fB\*p\fP's output.
Only an \*(``OK\*('' button is provided for input,
but an ESC exit status may be returned.
.
.
.IP "\fB\-\-tailboxbg \fIfile height width"
Display text from a file in a dialog box as a background task,
as in a \*(``tail -f &\*('' command.
Scroll left/right using vi-style 'h' and 'l', or arrow-keys.
A '0' resets the scrolling.
.IP
\*L treats the background task specially if there are other
widgets (\fB\-\-and\-widget\fP) on the screen concurrently.
Until those widgets are closed (e.g., an \*(``OK\*(''),
\fB\*p\fP will perform all of the tailboxbg widgets in the same process,
polling for updates.
You may use a tab to traverse between the widgets on the screen,
and close them individually, e.g., by pressing \fIENTER\fP.
Once the non-tailboxbg widgets are closed,
\fB\*p\fP forks a copy of itself into the background,
and prints its process id if the \*(``\fB\-\-no\-kill\fP\*('' option
is given.
.IP
On exit, no text is written to \fB\*p\fP's output.
Only an \*(``EXIT\*('' button is provided for input,
but an ESC exit status may be returned.
.IP
NOTE:
Older versions of \fB\*p\fP forked immediately and attempted to
update the screen individually.
Besides being bad for performance,
it was unworkable.
Some older scripts may not work properly with the polled scheme.
.
.
.IP "\fB\-\-textbox \fIfile height width"
A
\fBtext\fP
box lets you display the contents of a text file in a dialog box.
It is like a simple text file viewer.
The user can move through the file by using the
cursor, page-up, page-down
and \fIHOME/END\fR keys available on most keyboards.
If the lines are too long to be displayed in the box,
the \fILEFT/RIGHT\fP
keys can be used to scroll the text region horizontally.
You may also use vi-style keys h, j, k, and l in place of the cursor keys,
and B or N in place of the page-up and page-down keys.
Scroll up/down using vi-style 'k' and 'j', or arrow-keys.
Scroll left/right using vi-style 'h' and 'l', or arrow-keys.
A '0' resets the left/right scrolling.
For more convenience,
vi-style forward and backward searching functions are also provided.
.IP
On exit, no text is written to \fB\*p\fP's output.
Only an \*(``EXIT\*('' button is provided for input,
but an ESC exit status may be returned.
.
.
.IP "\fB\-\-timebox \fItext height [width hour minute second]"
A dialog is displayed which allows you to select hour, minute and second.
If the values for hour, minute or second are missing or negative,
the current date's corresponding values are used.
You can increment or decrement any of those using the
left-, up-, right- and down-arrows.
Use tab or backtab to move between windows.
.IP
On exit, the result is printed in the form hour:minute:second.
The format can be overridden using the \fB\-\-time\-format\fP option.
.
.
.IP "\fB\-\-treeview \fItext height width list-height \fR[ \fItag item status depth \fR] \fI..."
Display data organized as a tree.
Each group of data contains a tag,
the text to display for the item,
its status (\*(``on\*('' or \*(``off\*('')
and the depth of the item in the tree.
.IP
Only one item can be selected (like the \fBradiolist\fP).
The tag is not displayed.
.IP
On exit, the tag of the selected item is written to \fB\*p\fP's output.
.
.
.IP "\fB\-\-yesno \fItext height width"
A \fByes/no\fP dialog box of
size \fIheight\fP rows by \fIwidth\fP columns will be displayed.
The string specified by
\fItext\fP
is displayed inside the dialog box.
If this string is too long to fit
in one line, it will be automatically divided into multiple lines at
appropriate places.
The
\fItext\fP
string can also contain the sub-string
.RI """" \en """"
or newline characters
.RI ` \en '
to control line breaking explicitly.
This dialog box is useful for
asking questions that require the user to answer either yes or no.
The dialog box has a
\fBYes\fP
button and a
\fBNo\fP
button, in which the user can switch between by pressing the
.IR TAB " key."
.IP
On exit, no text is written to \fB\*p\fP's output.
In addition to the \*(``Yes\*('' and \*(``No\*('' exit codes (see DIAGNOSTICS)
an ESC exit status may be returned.
.IP
The codes used for \*(``Yes\*('' and \*(``No\*(''
match those used for \*(``OK\*('' and \*(``Cancel\*('',
internally no distinction is made.
.
.\" ************************************************************************
.SS "Obsolete Options"
.\" from cdialog 0.9a (Pako)
.IP "\fB\-\-beep"
This was used to tell the original cdialog that it should make a beep
when the separate processes of the tailboxbg widget would repaint the screen.
.
.\" from cdialog 0.9a (Pako)
.IP "\fB\-\-beep\-after"
Beep after a user has completed a widget by pressing one of the buttons.
.
.\" ************************************************************************
.SS "Whitespace Options"
.PP
These options can be used to transform whitespace (space, tab, newline)
as dialog reads the script:
.RS
.BR \-\-cr\-wrap ,
.BR \-\-no\-collapse ,
.BR \-\-no\-nl\-expand ", and"
.B \-\-trim
.RE
.PP
The options are not independent:
.bP
\fB\*L\fP checks if the script contains at least one \*(``\en\*(''
and (unless \fB\-\-no\-nl\-expand\fP is set) will ignore the
\fB\-\-no\-collapse\fP and \fB\-\-trim\fP options.
.bP
After checking for \*(``\en\*('' and the \fB\-\-no\-nl\-expand\fP option,
\fB\*l\fP handles the \fB\-\-trim\fP option.
.IP
If the \fB\-\-trim\fP option takes effect,
then \fB\*l\fP ignores \fB\-\-no\-collapse\fP.
It changes sequences of tabs, spaces
(and newlines unless \fB\-cr\-wrap\fP is set) to a single space.
.bP
If neither the \*(``\en\*('' or \fB\-\-trim\fP cases apply,
\fB\*l\fP checks \fB\-\-no\-collapse\fP to decide whether to reduce
sequences of tabs and spaces to a single space.
.IP
In this case, \fB\*l\fP ignores \fB\-\-cr\-wrap\fP and does not modify newlines.
.PP
Taking those dependencies into account,
here is a table summarizing the behavior
for the various combinations of options.
The table assumes that the script contains at least one \*(``\en\*(''
when the \fB\-\-no\-nl\-expand\fP option is not set.
.na
.RS 5
.TS
tab(/) ;
lB lB lB lB lB
lB lB lB lB lB
_ _ _ _ _
lw4 lw4 lw4 lw4 lw29.
cr-/no-/no-/trim/Result
wrap/collapse/nl\-expand
no/no/no/no/T{
Convert tab to space.
Convert newline to space.
Convert \*(``\en\*('' to newline.
T}
no/no/no/yes/T{
Convert tab to space.
Convert newline to space.
Convert \*(``\en\*('' to newline.
T}
no/no/yes/no/T{
Convert tab to space.
Do not convert newline to space.
Convert multiple-space to single.
Show \*(``\en\*('' literally.
T}
no/no/yes/yes/T{
Convert tab to space.
Convert multiple-space to single.
Convert newline to space.
Show \*(``\en\*('' literally.
T}
no/yes/no/no/T{
Convert newline to space.
Convert \*(``\en\*('' to newline.
T}
no/yes/no/yes/T{
Convert newline to space.
Convert \*(``\en\*('' to newline.
T}
no/yes/yes/no/T{
Do not convert newline to space.
Do not reduce multiple blanks.
Show \*(``\en\*('' literally.
T}
no/yes/yes/yes/T{
Convert multiple-space to single.
Convert newline to space.
Show \*(``\en\*('' literally.
T}
yes/no/no/no/T{
Convert tab to space.
Wrap on newline.
Convert \*(``\en\*('' to newline.
T}
yes/no/no/yes/T{
Convert tab to space.
Wrap on newline.
Convert \*(``\en\*('' to newline.
T}
yes/no/yes/no/T{
Convert tab to space.
Do not convert newline to space.
Convert multiple-space to single.
Show \*(``\en\*('' literally.
T}
yes/no/yes/yes/T{
Convert tab to space.
Convert multiple-space to single.
Wrap on newline.
Show \*(``\en\*('' literally.
T}
yes/yes/no/no/T{
Wrap on newline.
Convert \*(``\en\*('' to newline.
T}
yes/yes/no/yes/T{
Wrap on newline.
Convert \*(``\en\*('' to newline.
T}
yes/yes/yes/no/T{
Do not convert newline to space.
Do not reduce multiple blanks.
Show \*(``\en\*('' literally.
T}
yes/yes/yes/yes/T{
Convert multiple-space to single.
Wrap on newline.
Show \*(``\en\*('' literally.
T}
.TE
.RE
.ad
.
.\" ************************************************************************
.SH "RUN-TIME CONFIGURATION"
.TP 4
1.
Create a sample configuration file by typing:
.LP
.Ex
\*p \-\-create\-rc \fIfile\fP
.Ee
.TP 4
2.
At start,
\fB\*p\fP
determines the settings to use as follows:
.RS
.TP 4
a)
if environment variable
\fBDIALOGRC\fP
is set, its value determines the name of the configuration file.
.TP 4
b)
if the file in (a) is not found, use the file
\fI$HOME/.dialogrc\fP
as the configuration file.
.TP 4
c)
if the file in (b) is not found, try using the GLOBALRC file determined at
compile-time, i.e., \fI/etc/dialogrc\fP.
.TP 4
d)
if the file in (c) is not found, use compiled in defaults.
.RE
.TP 4
3.
Edit the sample configuration file and copy it to some place that
\fB\*p\fP
can find, as stated in step 2 above.
.
.\" ************************************************************************
.SH "KEY BINDINGS"
You can override or add to key bindings in \fB\*p\fP
by adding to the configuration file.
\fB\*L\fP's \fBbindkey\fP command maps single keys to its internal coding.
.Ex
bindkey \fIwidget\fP \fIcurses_key\fP \fIdialog_key\fP
.Ee
.PP
The \fIwidget\fP name can be \*(``*\*('' (all widgets), or
specific widgets such as \fBtextbox\fP.
Specific widget bindings override the \*(``*\*('' bindings.
User-defined bindings override the built-in bindings.
.PP
The \fIcurses_key\fP can be expressed in different forms:
.bP
It may be any of the names derived from
\fBcurses.h\fP, e.g., \*(``HELP\*('' from \*(``KEY_HELP\*(''.
.bP
\fB\*L\fP also recognizes ANSI control characters
such as \*(``^A\*('', \*(``^?\*('',
as well as C1-controls such as \*(``~A\*('' and \*(``~?\*(''.
.bP
Finally, \fB\*l\fP allows backslash escapes as in C.
Those can be octal character values such as \*(``\\033\*(''
(the ASCII escape character),
or the characters listed in this table:
.RS 10
.TS
tab(/) ;
lI lI
_ _
l l .
Escaped/Actual
\\b/backspace
\\f/form feed
\\n/new line (line feed)
\\r/carriage return
\\s/space
\\t/tab
\\^/\*(``^\*('' (caret)
\\?/\*(``?\*('' (question mark)
\\\\/\*(``\\\*('' (backslash)
_
.TE
.RE
.PP
\fB\*L\fP's internal keycode names correspond to the
\fBDLG_KEYS_ENUM\fP type in
\fBdlg_keys.h\fP, e.g., \*(``HELP\*('' from \*(``DLGK_HELP\*(''.
.SS Widget Names
.PP
Some widgets (such as the formbox) have an area where fields can be edited.
Those are managed in a subwindow of the widget, and
may have separate keybindings from the main widget
because the subwindows are registered using a different name.
.RS 5
.TS
tab(/) ;
lI lI lI
_ _ _
l l l .
Widget/Window name/Subwindow Name
calendar/calendar
checklist/checklist
editbox/editbox/editbox2
form/formbox/formfield
fselect/fselect/fselect2
inputbox/inputbox/inputbox2
menu/menubox/menu
msgbox/msgbox
pause/pause
progressbox/progressbox
radiolist/radiolist
tailbox/tailbox
textbox/textbox/searchbox
timebox/timebox
yesno/yesno
_
.TE
.RE
.PP
Some widgets are actually other widgets,
using internal settings to modify the behavior.
Those use the same widget name as the actual widget:
.RS 5
.TS
tab(/) ;
lI lI
_ _
l l .
Widget/Actual Widget
dselect/fselect
infobox/msgbox
inputmenu/menu
mixedform/form
passwordbox/inputbox
passwordform/form
prgbox/progressbox
programbox/progressbox
tailboxbg/tailbox
_
.TE
.RE
.SS Built-in Bindings
This manual page does not list the key bindings for each widget,
because that detailed information can be obtained by running \fB\*p\fP.
If you have set the \fB\-\-trace\fP option,
\fB\*p\fP writes the key-binding information for each widget
as it is registered.
.PP
A few bindings are built-in, independent of particular widgets:
.TS
tab(/) ;
lI lI
_ _
l l .
Key/Purpose
Control-I/forward tab-traversal, e.g., with \fB\-\-tailboxbg\fP.
Control-L/repaints the screen.
Control-T/writes a screen dump to the \fB\-\-trace\fP file.
Control-V/suppresses special-keys for the next input byte.
DLGK_FIELD_NEXT/forward tab-traversal, like Control-I.
DLGK_FIELD_PREV/backward tab-traversal, like back-tab.
DLGK_HELPFILE/displays the help-file specified with \fB\-\-hfile\fP.
KEY_BTAB/backward tab-traversal, e.g., with \fB\-\-tailboxbg\fP.
_
.TE

.SS Example
Normally \fB\*p\fP uses different keys for navigating between the buttons
and editing part of a dialog versus navigating within the editing part.
That is, tab (and back-tab) traverse buttons
(or between buttons and the editing part),
while arrow keys traverse fields within the editing part.
Tabs are also recognized as a special case for traversing between
widgets, e.g., when using multiple tailboxbg widgets.
.PP
Some users may wish to use the same key for traversing within the
editing part as for traversing between buttons.
The form widget is written to support this sort of redefinition of
the keys, by adding a special group in \fBdlgk_keys.h\fP
for \*(``form\*('' (left/right/next/prev).
Here is an example binding demonstrating how to do this:
.Ex
bindkey formfield TAB  form_NEXT
bindkey formbox   TAB  form_NEXT
bindkey formfield BTAB form_prev
bindkey formbox   BTAB form_prev
.Ee
.PP
That type of redefinition would not be useful in other widgets,
e.g., calendar, due to the potentially large number of fields to traverse.
.
.\" ************************************************************************
.SH ENVIRONMENT
.TP 15
\fBDIALOGOPTS\fP
Define this variable to apply any of the common options to each widget.
Most of the common options are reset before processing each widget.
If you set the options in this environment variable,
they are applied to \fB\*p\fP's state after the reset.
As in the \*(``\fB\-\-file\fP\*('' option,
double-quotes and backslashes are interpreted.
.IP
The \*(``\fB\-\-file\fP\*('' option is not considered a common option
(so you cannot embed it within this environment variable).
.TP 15
\fBDIALOGRC\fP
Define this variable if you want to specify the name of the configuration file
to use.
.TP 15
\fBDIALOG_CANCEL\fP
.TP 15
\fBDIALOG_ERROR\fP
.TP 15
\fBDIALOG_ESC\fP
.TP 15
\fBDIALOG_EXTRA\fP
.TP 15
\fBDIALOG_HELP\fP
.TP 15
\fBDIALOG_ITEM_HELP\fP
.TP 15
\fBDIALOG_TIMEOUT\fP
.TP 15
\fBDIALOG_OK\fP
Define any of these variables to change the exit code on
.RS
.bP
Cancel (1),
.bP
error (\-1),
.bP
ESC (255),
.bP
Extra (3),
.bP
Help (2),
.bP
Help with \fB\-\-item\-help\fP (2),
.bP
Timeout (5), or
.bP
OK (0).
.RE
.IP
Normally shell scripts cannot distinguish between \-1 and 255.
.TP 15
\fBDIALOG_TTY\fP
Set this variable to \*(``1\*('' to provide compatibility with older versions
of \fB\*p\fP which assumed that if the script redirects the standard output,
that the \*(``\fB\-\-stdout\fP\*('' option was given.
.SH FILES
.TP 20
\fI$HOME/.dialogrc\fP
default configuration file
.SH EXAMPLES
The \fB\*p\fP sources contain several samples
of how to use the different box options and how they look.
Just take a look into the directory \fBsamples/\fP of the source.
.SH DIAGNOSTICS
Exit status is subject to being overridden by environment variables.
The default values and corresponding environment variables
that can override them are:
.TP 5
0
if the \fBYES\fP or \fBOK\fP button is pressed (DIALOG_OK).
.TP 5
1
if the
.BR No " or " Cancel
button is pressed (DIALOG_CANCEL).
.TP 5
2
if the
.B Help
button is pressed (DIALOG_HELP),
.br
except as noted below about DIALOG_ITEM_HELP.
.TP 5
3
if the
.B Extra
button is pressed (DIALOG_EXTRA).
.TP 5
4
if the
.B Help
button is pressed,
.br
and the \fB\-\-item\-help\fP option is set
.br
and the DIALOG_ITEM_HELP environment variable is set to 4.
.IP
While any of the exit-codes can be overridden using environment variables,
this special case was introduced in 2004 to simplify compatibility.
\fB\*L\fP uses DIALOG_ITEM_HELP (4) internally,
but unless the environment variable is also set,
it changes that to DIALOG_HELP (2) on exit.
.TP 5
5
if a timeout expires and the \fBDIALOG_TIMEOUT\fP variable is set to 5.
.TP 5
\-1
if errors occur inside \fB\*p\fP (DIALOG_ERROR)
or \fB\*p\fP exits because the \fIESC\fP key (DIALOG_ESC) was pressed.
.
.\" ************************************************************************
.SH PORTABILITY
\fB\*L\fP works with X/Open curses.
However, some implementations have deficiencies:
.RS 3
.bP
HPUX curses (and perhaps others) do not open the terminal properly for
the \fInewterm\fP function.
This interferes with \fB\*p\fP's \fB\-\-input\-fd\fP option,
by preventing cursor-keys and similar escape sequences from being recognized.
.bP
NetBSD 5.1 curses has incomplete support for wide-characters.
\fB\*p\fP will build, but not all examples display properly.
.RE
.\" ************************************************************************
.SH COMPATIBILITY
You may want to write scripts which run with
other \fB\*l\fP \*(``clones\*(''.
.SS Original Dialog
First, there is the \*(``original\*('' \fB\*p\fP program to consider
(versions 0.3 to 0.9).
It had some misspelled (or inconsistent) options.
The \fB\*p\fP program maps those deprecated options to the preferred ones.
They include:
.RS
.TS
tab(/) ;
lI lI
_ _
l l.
Option/Treatment
\fB\-\-beep\-after\fP/ignored
\fB\-\-guage\fP/mapped to \fB\-\-gauge\fP
_
.TE
.RE
.SS Xdialog
This is an X application, rather than a terminal program.
With some care, it is possible to write useful scripts that work
with both \fBXdialog\fP and \fB\*p\fP.
.PP
The \fB\*p\fP program ignores these options which are recognized
by \fBXdialog\fP:
.RS
.TS
tab(/) ;
lI lI
_ _
l l.
Option/Treatment
\fB\-\-allow\-close\fP/ignored
\fB\-\-auto\-placement\fP/ignored
\fB\-\-fixed\-font\fP/ignored
\fB\-\-icon\fP/ignored
\fB\-\-keep\-colors\fP/ignored
\fB\-\-no\-close\fP/ignored
\fB\-\-no\-cr\-wrap\fP/ignored
\fB\-\-screen\-center\fP/ignored
\fB\-\-separator\fP/mapped to \fB\-\-separate\-output\fP
\fB\-\-smooth\fP/ignored
\fB\-\-under\-mouse\fP/ignored
\fB\-\-wmclass\fP/ignored
_
.TE
.RE
.PP
\fBXdialog\fP's manpage has a section discussing its compatibility
with \fB\*p\fP.
There are some differences not shown in the manpage.
For example, the html documentation states
.RS
.PP
Note: former Xdialog releases used the \*(``\en\*('' (line feed) as a
results separator for the checklist widget;
this has been changed to \*(``/\*('' in Xdialog v1.5.0
to make it compatible with (c)dialog.
In your old scripts using the Xdialog checklist, you
will then have to add the \fB\-\-separate\-output\fP option before the
\fB\-\-checklist\fP one.
.RE
.PP
\fB\*L\fP has not used a different separator;
the difference was likely due to confusion regarding some script.
.SS Whiptail
Then there is \fBwhiptail\fP.
For practical purposes, it is maintained by Debian
(very little work is done by its upstream developers).
Its documentation (README.whiptail) claims
.Ex
\fBwhiptail\fP(1) is a lightweight replacement for \*p(1),
to provide dialog boxes for shell scripts.
It is built on the
newt windowing library rather than the ncurses library, allowing
it to be smaller in embedded environments such as installers,
rescue disks, etc.

whiptail is designed to be drop-in compatible with \*p, but
has less features: some dialog boxes are not implemented, such
as tailbox, timebox, calendarbox, etc.
.Ee
.PP
Comparing actual sizes (Debian testing, 2007/1/10):
The total of sizes for \fBwhiptail\fP,
the newt, popt and slang libraries is 757\ KB.
The comparable number for \fB\*p\fP (counting ncurses) is 520\ KB.
Disregard the first paragraph.
.PP
The second paragraph is misleading, since \fBwhiptail\fP
also does not work for common options of \fB\*p\fP,
such as the gauge box.
\fBwhiptail\fP is less compatible with \fB\*p\fP than the
original mid-1990s dialog 0.4 program.
.PP
\fBwhiptail\fP's manpage borrows features from \fB\*p\fP, e.g.,
but oddly cites only \fB\*p\fP versions up to 0.4 (1994) as a source.
That is, its manpage refers to features which
were borrowed from more recent versions of \fB\*p\fP, e.g.,
.bP
\fB\-\-gauge\fP (from 0.5)
.bP
\fB\-\-passwordbox\fP (from Debian changes in 1999),
.bP
\fB\-\-default\-item\fP (from \fB\*p\fP 2000/02/22),
.bP
\fB\-\-output\-fd\fP (from \fB\*p\fP 2002/08/14).
.PP
Debian uses \fBwhiptail\fP for the official \fB\*p\fP variation.
.PP
The \fB\*p\fP program ignores or maps these options which are recognized
by \fBwhiptail\fP:
.RS
.TS
tab(/) ;
lI lI
_ _
l l.
Option/Treatment
\fB\-\-cancel\-button\fP/mapped to \fB\-\-cancel\-label\fP
\fB\-\-fb\fP/ignored
\fB\-\-fullbutton\fP/ignored
\fB\-\-no\-button\fP/mapped to \fB\-\-no\-label\fP
\fB\-\-nocancel\fP/mapped to \fB\-\-no\-cancel\fP
\fB\-\-noitem\fP/mapped to \fB\-\-no\-items\fP
\fB\-\-notags\fP/mapped to \fB\-\-no\-tags\fP
\fB\-\-ok\-button\fP/mapped to \fB\-\-ok\-label\fP
\fB\-\-scrolltext\fP/mapped to \fB\-\-scrollbar\fP
\fB\-\-topleft\fP/mapped to \fB\-\-begin 0 0\fP
\fB\-\-yes\-button\fP/mapped to \fB\-\-yes\-label\fP
_
.TE
.RE
.LP
There are visual differences which are not addressed by command-line options:
.bP
\fB\*p\fP centers lists within the window.
\fBwhiptail\fP typically puts lists against the left margin.
.bP
\fBwhiptail\fP uses angle brackets (\*(``<\*('' and \*(``>\*('')
for marking buttons.
\fB\*p\fP uses square brackets.
.bP
\fBwhiptail\fP marks the limits of subtitles with vertical bars.
\fB\*p\fP does not mark the limits.
.bP
\fBwhiptail\fP attempts to mark the top/bottom cells of a scrollbar
with up/down arrows.
When it cannot do this,
it fills those cells with the background color
of the scrollbar and confusing the user.
\fB\*p\fP uses the entire scrollbar space,
thereby getting better resolution.
.\" ************************************************************************
.SH BUGS
Perhaps.
.SH AUTHOR
.LP
Thomas E.\& Dickey (updates for 0.9b and beyond)
.SH CONTRIBUTORS
Kiran Cherupally \(en the mixed form and mixed gauge widgets.
.LP
Tobias C.\& Rittweiler
.LP
Valery Reznic \(en the form and progressbox widgets.
.LP
Yura Kalinichenko adapted the gauge widget as \*(``pause\*(''.
.PP
This is a rewrite (except as needed to provide compatibility)
of the earlier version of \fB\*p 0.9a\fP,
which lists as authors:
.bP
Savio Lam \(en version 0.3, \*(``dialog\*(''
.bP
Stuart Herbert \(en patch for version 0.4
.bP
Marc Ewing \(en the gauge widget.
.bP
Pasquale De Marco \*(``Pako\*('' \(en version 0.9a, \*(``cdialog\*(''