TTY(1)TTY(1)NAMEtty - get the name of the terminal
SYNOPSIStty [ -l ] [ -s ]
DESCRIPTIONtty prints the path name of the user's terminal.
-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 code.
EXIT CODES
2 if invalid options were specified,
0 if standard input is a terminal,
1 otherwise.
DIAGNOSTICS
``not on an active synchronous line'' if the standard input is not a
synchronous terminal and -l is specified.
``not a tty'' if the standard input is not a terminal and -s is not
specified.
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