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13 .TH TTY 1 "Aug 11, 2009"
15 tty \- return user's terminal name
19 \fB/usr/bin/tty\fR [\fB-l\fR] [\fB-s\fR]
25 \fBtty\fR [ \fIoptions\fR ]
32 The \fBtty\fR utility writes to the standard output the name of the terminal
33 that is open as standard input. The name that is used is equivalent to the
34 string that would be returned by the \fBttyname\fR(3C) function.
38 The \fBksh93\fR \fBtty\fR built-in writes the name of the terminal that is
39 connected to standard input onto standard output. If the standard input is not
40 a terminal, "not a tty" will be written to standard output.
44 The following options are supported:
52 Prints the synchronous line number to which the user's terminal is connected,
53 if it is on an active synchronous line.
62 Inhibits printing of the terminal path name, allowing one to test just the exit
74 \fB\fB--line-number\fR\fR
77 Write the synchronous line number of the terminal on a separate line following
78 the terminal name line. If the standard input is not a synchronous terminal
79 then "not on an active synchronous line" is written.
89 \fB\fB--silent\fR|\fBquiet\fR\fR
92 Disable the terminal name line. Portable applications should use [[ -t 0 ]]
96 .SH ENVIRONMENT VARIABLES
99 See \fBenviron\fR(5) for descriptions of the following environment variables
100 that affect the execution of \fBtty\fR: \fBLANG\fR, \fBLC_ALL\fR,
101 \fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
105 The following exit values are returned:
112 Standard input is a terminal.
121 Standard input is not a terminal.
136 See \fBattributes\fR(5) for descriptions of the following attributes:
144 ATTRIBUTE TYPE ATTRIBUTE VALUE
148 Interface Stability Committed
150 Standard \fBstandards\fR(5).
156 \fBisatty\fR(3C), \fBttyname\fR(3C), \fBattributes\fR(5), \fBenviron\fR(5),
162 \fB\fBnot on an active synchronous line\fR\fR
166 The standard input is not a synchronous terminal and \fB-l\fR is specified.
172 \fB\fBnot a tty\fR\fR
176 The standard input is not a terminal and \fB-s\fR is not specified.
182 The \fB-s\fR option is useful only if the exit status is wanted. It does not
183 rely on the ability to form a valid path name. Portable applications should use