SC3008 – ShellCheck Wiki

In POSIX sh, select loops are undefined.

Problematic code:

#!/bin/sh
echo "Select file to show"
select input in *
do
  ls -l "$input"
done

Correct code:

Either switch to bash:

#!/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

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