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(sh-utils.info)Connectives for test

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Connectives for `test'
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   The usual logical connectives.

`! EXPR'
     True if EXPR is false.

`EXPR1 -a EXPR2'
     True if both EXPR1 and EXPR2 are true.

`EXPR1 -o EXPR2'
     True if either EXPR1 or EXPR2 is true.