4 This is the Gnu Readline library, version 5.2.
6 The Readline library provides a set of functions for use by applications
7 that allow users to edit command lines as they are typed in. Both
8 Emacs and vi editing modes are available. The Readline library includes
9 additional functions to maintain a list of previously-entered command
10 lines, to recall and perhaps reedit those lines, and perform csh-like
11 history expansion on previous commands.
13 The history facilites are also placed into a separate library, the
14 History library, as part of the build process. The History library
15 may be used without Readline in applications which desire its
18 The Readline library is free software, distributed under the terms of
19 the [GNU] General Public License, version 2. For more information, see
22 To build the library, try typing `./configure', then `make'. The
23 configuration process is automated, so no further intervention should
24 be necessary. Readline builds with `gcc' by default if it is
25 available. If you want to use `cc' instead, type
29 if you are using a Bourne-style shell. If you are not, the following
34 Read the file INSTALL in this directory for more information about how
35 to customize and control the build process.
37 The file rlconf.h contains C preprocessor defines that enable and disable
38 certain Readline features.
40 The special make target `everything' will build the static and shared
41 libraries (if the target platform supports them) and the examples.
46 There are several example programs that use Readline features in the
47 examples directory. The `rl' program is of particular interest. It
48 is a command-line interface to Readline, suitable for use in shell
49 scripts in place of `read'.
54 There is skeletal support for building shared versions of the
55 Readline and History libraries. The configure script creates
56 a Makefile in the `shlib' subdirectory, and typing `make shared'
57 will cause shared versions of the Readline and History libraries
58 to be built on supported platforms.
60 If `configure' is given the `--enable-shared' option, it will attempt
61 to build the shared libraries by default on supported platforms.
63 Configure calls the script support/shobj-conf to test whether or
64 not shared library creation is supported and to generate the values
65 of variables that are substituted into shlib/Makefile. If you
66 try to build shared libraries on an unsupported platform, `make'
67 will display a message asking you to update support/shobj-conf for
70 If you need to update support/shobj-conf, you will need to create
71 a `stanza' for your operating system and compiler. The script uses
72 the value of host_os and ${CC} as determined by configure. For
73 instance, FreeBSD 4.2 with any version of gcc is identified as
76 In the stanza for your operating system-compiler pair, you will need to
77 define several variables. They are:
79 SHOBJ_CC The C compiler used to compile source files into shareable
80 object files. This is normally set to the value of ${CC}
81 by configure, and should not need to be changed.
83 SHOBJ_CFLAGS Flags to pass to the C compiler ($SHOBJ_CC) to create
84 position-independent code. If you are using gcc, this
85 should probably be set to `-fpic'.
87 SHOBJ_LD The link editor to be used to create the shared library from
88 the object files created by $SHOBJ_CC. If you are using
89 gcc, a value of `gcc' will probably work.
91 SHOBJ_LDFLAGS Flags to pass to SHOBJ_LD to enable shared object creation.
92 If you are using gcc, `-shared' may be all that is necessary.
93 These should be the flags needed for generic shared object
96 SHLIB_XLDFLAGS Additional flags to pass to SHOBJ_LD for shared library
97 creation. Many systems use the -R option to the link
98 editor to embed a path within the library for run-time
99 library searches. A reasonable value for such systems would
102 SHLIB_LIBS Any additional libraries that shared libraries should be
103 linked against when they are created.
105 SHLIB_LIBPREF The prefix to use when generating the filename of the shared
106 library. The default is `lib'; Cygwin uses `cyg'.
108 SHLIB_LIBSUFF The suffix to add to `libreadline' and `libhistory' when
109 generating the filename of the shared library. Many systems
110 use `so'; HP-UX uses `sl'.
112 SHLIB_LIBVERSION The string to append to the filename to indicate the version
113 of the shared library. It should begin with $(SHLIB_LIBSUFF),
114 and possibly include version information that allows the
115 run-time loader to load the version of the shared library
116 appropriate for a particular program. Systems using shared
117 libraries similar to SunOS 4.x use major and minor library
118 version numbers; for those systems a value of
119 `$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)$(SHLIB_MINOR)' is appropriate.
120 Systems based on System V Release 4 don't use minor version
121 numbers; use `$(SHLIB_LIBSUFF).$(SHLIB_MAJOR)' on those systems.
122 Other Unix versions use different schemes.
124 SHLIB_DLLVERSION The version number for shared libraries that determines API
125 compatibility between readline versions and the underlying
126 system. Used only on Cygwin. Defaults to $SHLIB_MAJOR, but
127 can be overridden at configuration time by defining DLLVERSION
130 SHLIB_DOT The character used to separate the name of the shared library
131 from the suffix and version information. The default is `.';
132 systems like Cygwin which don't separate version information
133 from the library name should set this to the empty string.
135 SHLIB_STATUS Set this to `supported' when you have defined the other
136 necessary variables. Make uses this to determine whether
137 or not shared library creation should be attempted.
139 You should look at the existing stanzas in support/shobj-conf for ideas.
141 Once you have updated support/shobj-conf, re-run configure and type
142 `make shared'. The shared libraries will be created in the shlib
145 If shared libraries are created, `make install' will install them.
146 You may install only the shared libraries by running `make
147 install-shared' from the top-level build directory. Running `make
148 install' in the shlib subdirectory will also work. If you don't want
149 to install any created shared libraries, run `make install-static'.
154 The documentation for the Readline and History libraries appears in
155 the `doc' subdirectory. There are three texinfo files and a
156 Unix-style manual page describing the facilities available in the
157 Readline library. The texinfo files include both user and
158 programmer's manuals. HTML versions of the manuals appear in the
159 `doc' subdirectory as well.
164 Bug reports for Readline should be sent to:
168 When reporting a bug, please include the following information:
170 * the version number and release status of Readline (e.g., 4.2-release)
171 * the machine and OS that it is running on
172 * a list of the compilation flags or the contents of `config.h', if
174 * a description of the bug
175 * a recipe for recreating the bug reliably
176 * a fix for the bug if you have one!
178 If you would like to contact the Readline maintainer directly, send mail
179 to bash-maintainers@gnu.org.
181 Since Readline is developed along with bash, the bug-bash@gnu.org mailing
182 list (mirrored to the Usenet newsgroup gnu.bash.bug) often contains
183 Readline bug reports and fixes.