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+## You need a space before the !.
+
+### Problematic code:
+
+```sh
+while! [ -f file ]
+do sleep 1; done
+```
+
+### Correct code:
+
+```sh
+while ! [ -f file ]
+do sleep 1; done
+```
+### Rationale:
+
+ShellCheck found a keyword immediately followed by a `!`. There needs to be a space between them.
+
+### Exceptions:
+
+None
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