Asides

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https://bash.cyberciti.biz/guide/Main_Page

Shell Field Guide
This booklet is intended to be a catalog of tricks and techniques you may want to use if you’re doing some sort of complex scripting. Some are just useful, some are more playful, and might not have such direct impact in your day-to-day life. Some are pure entertainment.
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https://raimonster.com/scripting-field-guide/index.html

Credits
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https://github.com/erichs/composure

SHMIG
See https://github.com/mbucc/shmig_test. Edit the function sqlite3_up_text() and sqlite3_down_text() in shmig if you don’t like the default SQL template.
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https://github.com/mbucc/shmig

drwetter/testssl.sh
Intro testssl.sh is a free command line tool which checks a server’s service on any port for the support of TLS/SSL ciphers, protocols as well as some cryptographic flaws. Key features Clear output: you can tell easily whether anything is good or bad.
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https://github.com/drwetter/testssl.sh

BashPitfalls
This page is a compilation of common mistakes made by bash users. Each example is flawed in some way. Yes, it would be great if you could just treat the output of ls or find as a list of filenames and iterate over it. But you cannot.
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https://mywiki.wooledge.org/BashPitfalls

Bash With Nails
Bash With Nails (rhymes with ruby on rails) is a bash framework written for fun and profit. I’m kidding about the fun and profit part.
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https://github.com/mindaugasbarysas/bashwithnails

Learn
Nix is a package manager which comes in a form of many command line tools. Packages that Nix can build are defined with the Nix Expression Language.
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https://nixos.org/learn.html

cheat cheat allows you to create and view interactive cheatsheets on the command-line. It was designed to help remind *nix system administrators of options for commands that they use frequently, but not frequently enough to remember. Use cheat with cheatsheets.
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https://github.com/cheat/cheat

The command line is something every developer should learn and implement into their daily routine. It has become a Swiss Army knife of features behind deceptively simple commands, which allow you to gain greater control of your system, become more productive, and much more.
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https://www.educative.io/blog/bash-shell-command-cheat-sheet