1 SC3032

Vidar Holen edited this page 2022-11-02 20:57:28 -07:00

Table of Contents

• In POSIX sh, coproc is undefined.
• Problematic code:
• Correct code:
• Rationale:
• Exceptions:
• Related resources:

In POSIX sh, coproc is undefined.

Problematic code:

#!/bin/sh
coproc nc shellcheck.net 80

Correct code:

Either switch to Bash:

#!/usr/bin/env bash
coproc nc shellcheck.net 80

or try to write your script in a POSIX compatible way using named pipes.

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 coproc, though many use cases can be rewritten via redirection to named pipes (mkfifo).

Exceptions:

None

Related resources:

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

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