Bash
From wikinotes
The bourne again shell (BASH) is a common shell.
Documentation
official docs https://www.gnu.org/software/bash/manual/bash.html
Tutorials
bash one liners https://github.com/onceupon/Bash-Oneliner
Builtin Docs
Info pages are the easiest way to grab information about bash builtins.
info bash # show infopage /readarray # searchterm
Intro/Reference
bash basics bash configuration
Bash Libraries
Programs: shell libraries
Syntax
Features
bash random bash functional
Tools
bash profiling bash testing
Other
bash tricks Programs: coreutils