File: coreutils.info, Node: tty invocation, Prev: printenv invocation, Up: Working context
19.4 'tty': Print file name of terminal on standard input
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'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 *note 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
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