1 SC3008

Vidar Holen edited this page 2022-11-02 20:45:58 -07:00

Table of Contents

• In POSIX sh, select loops are undefined.
• Problematic code:
• Correct code:
• Rationale:
• Exceptions:
• Related resources:

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

Related resources:

• Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!

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