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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.
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