How to: ShellCheck - A shell script static analysis tool
ShellCheck is a GPLv3 tool that gives warnings and suggestions for bash/sh shell scripts:

![Screenshot of a terminal showing problematic shell script lines highlighted](doc/terminal.png)

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.

See [the gallery of bad code](README.md#user-content-gallery-of-bad-code) for examples of what ShellCheck can help you identify!