V3/usr/man/man1/tty.1

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NAME		tty  --  get tty name
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SYNOPSIS	tty___
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DESCRIPTION	tty___ gives the name of the user's typewriter
in the form "ttyn" for n_ a digit.  The actual path
name is then "/dev/ttyn".
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FILES		--
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SEE ALSO	--
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DIAGNOSTICS	"not a tty" if the standard input file is not a typewriter.
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BUGS		--