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UNIX in a Nutshell: System V Edition

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UNIX Commands
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Test whether standard input is running under layers . (Command name comes from " Is the m ulti p le x or running?") Output is either yes (exit status 0) or no (exit status 1). Useful for shell scripts that send programs to a windowing terminal or depend on screen size.



Suppress output and return exit status only.

Example shell script

if ismpx -s
then jwin

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