ShellCheck 0.6.0

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.