Strongly suggest using shellcheck over your shell scripts to fix errors and warnings

[pierre-rouleau]

Is your feature request related to a problem? Please describe.

The shell scripts of this project use /bin/sh in the shebang line, which means they are trying to be POSIX compliant. However, there is a lot of errors in most of them, errors reported by shellcheck.

See https://github.com/koalaman/shellcheck

I strongly recommend using this to fix the numerous issues.

On the configure file in the project root, shellcheck reports reports 827 errors/warnings/info

Describe the solution you'd like

Use shellcheck

Describe alternatives you've considered

Shellcheck is really good, use the latest version you can find.

Additional context

No response