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lang-bash
., so that[ -x '' ]may return true if the user has scan permission on the current directory; this leads to a false positive. (Fortunately this only affects a few older systems that are technically not POSIX compliant.) More resilient would bething_path=$( command -v thing ) && [ -x "$thing_path" ][ -x "$(command -v echo)" ]; echo $?prints 1!testalso fails.alias pip='pip3'; [ -x "$(command -v pip)" ]; echo $? ` prints 1!