tty invocation (GNU Coreutils 9.0)
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Coreutils/docs/latest/tty-invocation
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19.4 tty: Print file name of terminal on standard input
tty
prints the file name of the terminal connected to its standard input. It prints ‘not a tty
’ if standard input is not a terminal. Synopsis:
tty [option]…
The program accepts the following option. Also see Common options.
- ‘
-s
’
‘--silent
’
‘--quiet
’ Print nothing; only return an exit status.
Exit status:
0 if standard input is a terminal 1 if standard input is a non-terminal file 2 if given incorrect arguments 3 if a write error occurs