POSIX

PRIMARY CATEGORY → SHELL SCRIPTING

The Open Group	See here
Wooledge	See here

Shellcheck

Shell Script Static Analysis Tool → Github 😼

It can be found as Web Interface

It also can be installed as CLI Tool/Utility →

$ sudo apt install -y -- shellcheck # Debian-based Distro

POSIX Compliant Check

$ shellcheck --shell=sh # or shell=dash