Documentation:

• Tutorials (http://www.actcom.co.il/~choo/lupg/tutorials/index.html) from Little Unix Programmers Group (LUPG)'s Little Site
• Unix Tutorials (http://www.eecs.ukans.edu/sys_adm/Unix_tutorials/)
• Unix Serial Port Resources (http://www.stokely.com/stokely/unix.serial.port.resources/index.html)
• Index of /CC/Courses (http://www.strath.ac.uk/CC/Courses/)
• Unix Guru Universe (http://www.ugu.com/)
• UNIXhelp home page (http://www.ucs.ed.ac.uk/~unixhelp/index.html)
• The WebTechniques Perl Columns (http://www.stonehenge.com/merlyn/WebTechniques/)- monthly column for Web Techniques magazine (by Randal L. Schwartz )

Sources:

• Great Unix Src Software Archive (http://www.rz.go.dlr.de:8081/unix/src/misc/index_t.html)

Columns:

• SunWorld's Unix 101 (http://www.sun.com/sunworldonline/common/swol-backissues-columns.html#unix101)by Mo Budlong
• The Unix Review Perl Columns (http://www.stonehenge.com/merlyn/UnixReview/)- bi-monthly column for Unix Review magazine (by Randal L. Schwartz)
• UNIX Review (http://www.mfi.com/unixrev/)