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+## This function is never invoked. Check usage (or ignored if invoked indirectly).
+
+### Problematic code:
+
+```sh
+#!/bin/sh
+f() {
+  echo "Hello World"
+}
+exit
+```
+
+### Correct code:
+
+```sh
+#!/bin/sh
+f() {
+  echo "Hello World"
+}
+f
+exit
+```
+### Rationale:
+
+ShellCheck found a function that goes out of scope before it's ever invoked. Verify that the function is called. It could be misspelled, or its invocation could also be unreachable (as in `f() { ..; }; exit; f`).
+
+Note that if the example script did not end in `exit`, this warning would not be emitted. This is because the function could be invoked by another script that `source`s it.
+
+### Exceptions:
+
+ShellCheck is currently bad at figuring out functions that are invoked via `trap`. In such cases, please [[ignore]] the message with a directive.
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
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