Overall a good article. I cannot say that I agree with everything, but that does not really matter. All information we find should be taken with a grain of salt.
I would maybe add a really good resource, mywiki.wooledge.org/FullBashGuide and related sites (Pitfalls, FAQ), and also #bash channel on Freenode.
Also one good advice I have learned during my journey, it is useful know that some commands, syntax and also a lot of advice on Internet are outdated or obsolete. wiki.bash-hackers.org/scripting/ob...
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