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UNIX in a Nutshell: System V Edition

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UNIX Commands
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test

test expression
or
[ expression ]

Evaluate an expression and, if its value is true, return a zero exit status; otherwise, return a nonzero exit status. In shell scripts, you can use the alternate form [ expression ]. This command is generally used with conditional constructs in shell programs. See Section 4 for more information on test.


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