ShellCheck – Automatically Detects Problems with sh/bash Scripts and Commands
ShellCheck is a static analysis and linting tool for sh/bash scripts. It's mainly focused on handling typical beginner and intermediate level syntax errors and pitfalls where the shell just gives a cryptic error message or strange behavior, but it also reports on a few more advanced issues where corner cases can cause delayed failures.
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Haskell source code is available on GitHub!
Gloss