Created SC2105 (markdown)

SC2105.md

@@ -0,0 +1,35 @@
+## `break` is only valid in loops
+
+### Problematic code:
+
+```sh
+case "$1" in
+    -v)
+       verbose=1
+       break
+       ;;
+    -d)
+       debug=1
+esac
+```
+
+### Correct code:
+
+```sh
+case "$1" in
+    -v)
+       verbose=1
+       ;;
+    -d)
+       debug=1
+esac
+```
+### Rationale:
+
+`break` or `continue` was found outside a loop. These statements are only valid in loops. In particular, `break` is not required in `case` statements as there is no implicit fall-through.
+
+To return from a function or sourced script, use `return`. To exit a script, use `exit`.
+
+### Exceptions:
+
+It's possible to `break`/`continue` in a function without a loop. The call will then affect the loop -- if any -- that the function is invoked from. This is obviously not good coding practice.