UNIX in a Nutshell: System V Edition

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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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