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+## This word is constant. Did you forget the $ on a variable?
+
+### Problematic code:
+
+```sh
+case foo in
+  bar) echo "Match"
+esac
+```
+
+### Correct code:
+
+```sh
+case $foo in
+  bar) echo "Match"
+esac
+```
+### Rationale:
+
+You are using a `case` statement to compare a literal word.
+
+You most likely wanted to treat this word as a `$variable` or `$(command)` instead.
+
+### Exceptions:
+
+None
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