UNIX in a Nutshell: System V Edition

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UNIX Commands
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tty [options]

Print the device name of your terminal. This is useful for shell scripts and often for commands that need device information.



Print the synchronous line number.


Return only the codes: 0 (a terminal), 1 (not a terminal), 2 (invalid options used).

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Reference: tsortBook IndexReference: umask

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