shellcheck - 0.5.0-3 main

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