[[
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.
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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