Learn The Command Line
Learn Enough Command Line to Be Dangerous by Michael Hartl - a tutorial introduction to the Unix command line.
Codecademy's Learn the Command Line - interactive course.
LinuxCommand and The Linux Command Line book by William Shotts
The Art of Command Line - master the command line, in one page.
Bash Guide - a guide to learn bash.
Shell Style Guide by Paul Armstrong
The Bash Hackers Wiki - human-readable documentation.
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