Sources
- http://www.lunarc.lu.se/Support/Tutorials/lunarc/images/putty-main-window-01.png
- http://www.ee.surrey.ac.uk/Teaching/Unix/unixintro.html
- http://support.uchicago.edu/docs/misc/unix/tutorial/basic02.html
- http://www.kennesaw.edu/help/tech/command.html
- http://www.emba.uvm.edu/CF/basic.html#write
- http://www.cotse.com/unixcommands1.html
- http://are.berkeley.edu/mason/computing/help/tutorials/unix/
- http://www.indiana.edu/~uitspubs/b103/
- http://www.usd.edu/trio/tut/pico/start.html
- http://www.aota.net/Telnet/pico.php4
- http://www.library.yale.edu/wsg/docs/vi/
- http://www.ms.washington.edu/help/editors/vi.html
- http://www.eng.hawaii.edu/Tutor/vi.html#intro
