Why do [[ -z ]] and [[ -v ]] have different syntax? – unix.stackexchange.com

Why do [[ -z ]] and [[ -v ]] have different syntax? – unix.stackexchange.com

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If I want to perform some commands given variables aren't set I'm using: if [[ -z "$a" || -z "$v" ]] then echo "a or b are not set" fi Yet the same syntax doesn't work with -v, I have to use: if ...

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