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+## This case is not specified by getopts.
+
+### Problematic code:
+
+```sh
+while getopts "vr" n
+do
+  case "$n" in
+    v) echo "Verbose" ;;
+    r) echo "Recursive" ;;
+    n) echo "Dry-run" ;;
+    *) usage;;
+  esac
+done
+```
+
+### Correct code:
+
+```sh
+while getopts "vrn" n    # 'n' added here
+do
+  case "$n" in
+    v) echo "Verbose" ;;
+    r) echo "Recursive" ;;
+    n) echo "Dry-run" ;;
+    *) usage;;
+  esac
+done
+```
+### Rationale:
+
+You have a `case` statement in a `while getopts` loop that matches a flag that hasn't been provided in the `getopts` option string.
+
+Either add the flag to the options list, or delete the case statement.
+
+### Exceptions:
+
+None.
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