How to test if a parameter has been set to the empty string? – unix.stackexchange.com

How to test if a parameter has been set to the empty string? – unix.stackexchange.com

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I want to test if a parameter is "". When the parameter is not set, the test should fail. Why does the following not succeed? $ unset aa $ if [ ${aa}=="" ]; then echo yes; else echo no; fi yes ...

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