In Bash scripts, any command following a && will only execute if the previous conditional or command succeeded (returned 0)
The following script will only print out the variable if the conditional succeeds:
[[-z "$1"]] && echo "$1"
On the other hand, any command following a || will only execute if the previous conditional or command failed (returned a non zero)
The following script will only print out the variable if the conditional fails:
[[-z "$1"]] || echo "$1"
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