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UNIX in a Nutshell: System V Edition

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The Bourne Shell and Korn Shell
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[[ ]]



[[



expression



]]

Korn shell only. Same as test expression or [ expression ] , except that [[ ]] allows additional operators. Word splitting and filename expansion are disabled. Note that the brackets ( [ ] ) are typed literally.

Additional operators

&&

Logical AND of test expressions.

||

Logical OR of test expressions.

>

First string is lexically "greater than" the second.

<

First string is lexically "less than" the second.


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