ports/devel/shellcheck/pkg/DESCR

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ShellCheck is a shell script static analysis tool. The goals of
ShellCheck are:
* To point out and clarify typical beginner's syntax issues, that
causes a shell to give cryptic error messages.
* To point out and clarify typical intermediate level semantic
problems, that causes 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.