How to tell if a string is not defined in a Bash shell script How to tell if a string is not defined in a Bash shell script shell shell

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How to tell if a string is not defined in a Bash shell script

bash shell scripting string null

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Identifying and removing null characters in UNIX

unix shell null special-characters

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How to handle JMESPath contains filter on attribute that may be null?

shell azure null filtering jmespath

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How to check jq result is null or not?

json bash shell null jq

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Is the shell : command portable?

bash shell null zsh csh

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