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Instead of [ a && b ], use [ a ] && [ b ].

Problematic code:

[ "$1" = "-v" && -z "$2" ]

Correct code:

[ "$1" = "-v" ] && [ -z "$2" ]

Rationale:

&& can not be used in a [ .. ] test expression. Instead, make two [ .. ] expressions and put the && between them.

Exceptions:

None.

Related resources:

• Bash Pitfalls: [ "$foo" = bar && "$bar" = foo ]
• StackOverflow: using and (&&) operator in if statement bash script

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