ShellCheck is a GPLv3 tool that gives warnings and suggestions for
bash/sh shell scripts.
The goals of ShellCheck are:
* To point out and clarify typical beginner's syntax issues that cause
a shell to give cryptic error messages.
* To point out and clarify typical intermediate level semantic problems
that cause a shell to behave strangely and counter-intuitively.
* To point out subtle caveats, corner cases and pitfalls that may cause
an advanced user's otherwise working script to fail under future
circumstances.
