tty(1) User Commands tty(1)NAMEtty - return user's terminal name
SYNOPSIS
/usr/bin/tty [-l] [-s]
ksh93
tty [ options ]
DESCRIPTION
/usr/bin/tty
The tty utility writes to the standard output the name of the terminal
that is open as standard input. The name that is used is equivalent to
the string that would be returned by the ttyname(3C) function.
ksh93
The ksh93 tty built-in writes the name of the terminal that is con‐
nected to standard input onto standard output. If the standard input is
not a terminal, "not a tty" will be written to standard output.
OPTIONS
The following options are supported:
/usr/bin/tty
-l Prints the synchronous line number to which the user's terminal
is connected, if it is on an active synchronous line.
-s Inhibits printing of the terminal path name, allowing one to test
just the exit status.
ksh93
-l Write the synchronous line number of the terminal on
--line-number a separate line following the terminal name line. If
the standard input is not a synchronous terminal then
"not on an active synchronous line" is written.
-s Disable the terminal name line. Portable applications
--silent|quiet should use [[ -t 0 ]] instead.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables
that affect the execution of tty: LANG, LC_ALL, LC_CTYPE, LC_MES‐
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 Standard input is a terminal.
1 Standard input is not a terminal.
>1 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWcs │
├─────────────────────────────┼─────────────────────────────┤
│CSI │Enabled │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
├─────────────────────────────┼─────────────────────────────┤
│Standard │standards(5). │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOisatty(3C), ttyname(3C), attributes(5), environ(5), standards(5)DIAGNOSTICS
not on an active synchronous line
The standard input is not a synchronous terminal and -l is speci‐
fied.
not a tty
The standard input is not a terminal and -s is not specified.
NOTES
The -s option is useful only if the exit status is wanted. It does not
rely on the ability to form a valid path name. Portable applications
should use test -t.
SunOS 5.11 11 Aug 2009 tty(1)