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by 5e92cb50239222b 752 days ago
Most are documented by shellcheck.

https://gist.github.com/nicerobot/53cee11ee0abbdc997661e65b3...

But you don't really need to spend any time learning them, just plug shellcheck itself into your editor and go write some scripts. I've written don't know how many thousands of lines of bash (and sh, depending on the task at hand) that work across five operating systems, and it's honestly a non-issue if you follow the warnings.