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+## In POSIX sh, select loops are undefined.
+
+### Problematic code:
+
+```sh
+#!/bin/sh
+echo "Select file to show"
+select input in *
+do
+  ls -l "$input"
+done
+```
+
+### Correct code:
+
+Either switch to bash:
+
+```sh
+#!/usr/bin/env bash
+echo "Select file to show"
+select input in *
+do
+  ls -l "$input"
+done
+```
+
+Or write your own menu.
+
+### Rationale:
+
+Your script uses a shell feature not supported by the shebang. Either rewrite the script to be portable, or change the shebang to explicitly require a shell like Bash. There is no simple substitution for a `select` loop, so either write your own using compatible constructs like `for` loops, or switch to a shell that supports them.
+
+### Exceptions:
+
+None
+
+### Related resources:
+
+* Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!
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