Hello Dennis, If it doesn't make your cheatsheet too verbose, I would highly recommend adding in |, >, and <. I use them very often, and they open up a lot of options for a user.
It may be going a little beyond the basics, but sed and awk are also really handy to keep in mind for altering files and streams. I think that they can do a lot of work most people assume they can't do or would have to write a program for.
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