Références
| UNIX.org | http://wwww.unix.org |
| GNU.org | http://wwww.gnu.org |
| Free BSD | http://wwww.freebsd.org |
| Linux.org | http://wwww.linux.org |
Ressources
| UNIX Guru Universe | http://www.ugu.com/ |
| UNIX.com | http://wwww.unix.com |
| Unix Help | http://unixhelp.ed.ac.uk |
| UNIX.org | http://wwww.unix.org |
| GNU.org | http://wwww.gnu.org |
| Free BSD | http://wwww.freebsd.org |
| Linux.org | http://wwww.linux.org |
| UNIX Guru Universe | http://www.ugu.com/ |
| UNIX.com | http://wwww.unix.com |
| Unix Help | http://unixhelp.ed.ac.uk |