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lang-bash
&&/||are not bashisms. They were already present in the Bourne shell in the 70s. They're also present in csh which make them more portable thanifwhose syntax is different between Bourne-like shells and csh. Using them in place ofifconstructs is often considered bad practice though. Note that[ -z "$file" ]would also return true if the script is called with-i ''(likely not a problem in practice)