- 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.