- http://wwwhomes.doc.ic.ac.uk/*tilde*wjk/UnixIntro/
- http://wwwhomes.doc.ic.ac.uk/*tilde*wjk/UnixIntro/
- http://www.ee.surrey.ac.uk/Teaching/Unix/
- http://info.ee.surrey.ac.uk/Teaching/Unix/unixintro.html
- http://8help.osu.edu/wks/unix_course/intro-1.html
- http://www.utexas.edu/learn/unix/
