The following are the various options for logical operations using test, which is taken from the Bash reference manual available at http://www.gnu.org/software/bash/:
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Test Operator
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Tests True If
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[ string_1 -a string_1 ]
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Both string_1 and string_2 are true
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[ string_1 -o string_2 ]
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Either string_1 or string_2 is true
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[ ! string_1 ]
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Not a string_1 match
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[[ pattern_1 && pattern_2 ]]
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Both pattern_1 and pattern_2 are true
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[[ pattern_1 || pattern_2 ]]
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Either pattern_1 or pattern_2 is true
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[[ ! pattern ]]
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Not a pattern match
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We can use the test operator for strings along with pattern matching as follows:
$ name=Ganesh $ [[ $name == [Gg]anesh ]] # Wildcards allowed $ echo $? 0 ...
