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+## You need a space here
+
+### Problematic code:
+
+    if ![-z foo ]; then true; fi
+
+### Correct code:
+
+    if ! [ -z foo ]; then true; fi
+
+### Rationale:
+
+Bourne shells are very whitespace sensitive. Adding or removing spaces can drastically alter the meaning of a script. In these cases, ShellCheck has noticed that you're missing a space at the position indicated.
+
+### Contraindications
+
+None.
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