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Common Lisp for Shell Scripting
... let's use SBCL instead of bash!.
Which is part of the reason Python took off for sysadmin tasks: it's fairly ubiquitous (just like bash), it's easy to write, no compile times, etc. As it turns out, the requirements for a "build system" and a "shell script" are fairly similar; thus, UIOP doesn't disappoint here, either. Even on Windows, you might have a bash implementation, if you figure out how to launch it from the standard Win command line instead of a fancy MINGW launcher.
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