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47 .TH TTY 1 "Aug 11, 2009"
49 tty \- return user's terminal name
53 \fB/usr/bin/tty\fR [\fB-l\fR] [\fB-s\fR]
59 \fBtty\fR [ \fIoptions\fR ]
66 The \fBtty\fR utility writes to the standard output the name of the terminal
67 that is open as standard input. The name that is used is equivalent to the
68 string that would be returned by the \fBttyname\fR(3C) function.
72 The \fBksh93\fR \fBtty\fR built-in writes the name of the terminal that is
73 connected to standard input onto standard output. If the standard input is not
74 a terminal, "not a tty" will be written to standard output.
78 The following options are supported:
86 Prints the synchronous line number to which the user's terminal is connected,
87 if it is on an active synchronous line.
96 Inhibits printing of the terminal path name, allowing one to test just the exit
108 \fB\fB--line-number\fR\fR
111 Write the synchronous line number of the terminal on a separate line following
112 the terminal name line. If the standard input is not a synchronous terminal
113 then "not on an active synchronous line" is written.
123 \fB\fB--silent\fR|\fBquiet\fR\fR
126 Disable the terminal name line. Portable applications should use [[ -t 0 ]]
130 .SH ENVIRONMENT VARIABLES
133 See \fBenviron\fR(5) for descriptions of the following environment variables
134 that affect the execution of \fBtty\fR: \fBLANG\fR, \fBLC_ALL\fR,
135 \fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
139 The following exit values are returned:
146 Standard input is a terminal.
155 Standard input is not a terminal.
170 See \fBattributes\fR(5) for descriptions of the following attributes:
178 ATTRIBUTE TYPE ATTRIBUTE VALUE
182 Interface Stability Committed
184 Standard \fBstandards\fR(5).
190 \fBisatty\fR(3C), \fBttyname\fR(3C), \fBattributes\fR(5), \fBenviron\fR(5),
196 \fB\fBnot on an active synchronous line\fR\fR
200 The standard input is not a synchronous terminal and \fB-l\fR is specified.
206 \fB\fBnot a tty\fR\fR
210 The standard input is not a terminal and \fB-s\fR is not specified.
216 The \fB-s\fR option is useful only if the exit status is wanted. It does not
217 rely on the ability to form a valid path name. Portable applications should use