Allexperts Unix Q and A  
   Volunteer experts answer your questions about Unix.
   http://www.allexperts.com/software/unix.shtml

Examware  
   Unix tutorials, exercises and resources. Features on-line tests and training materials.
   http://examware.com/tutor5.html

Unix Seventh Edition Manual  
   Source material from Bell Labs.
   http://www.cs.bell-labs.com/7thEdMan/

Unix Manuals  
   Brief Unix tutorial, online man pages and reference materials for the Unix operating system and common Unix utilities.
   http://www.unix-manuals.com

Unix Guru Universe  
   Searchable collection of articles and guides for Unix administrators and power-users. Offers materials on all major and many minor distributions.
   http://www.ugu.com/

Unix for Beginners  
   Brian Kernighan's 1979 classic introduction to the facilities Unix offers, from the 7th Edition manual.
   http://www.de.freebsd.org/de/7thEdManVol2/beginners/beginners.html

Tru64-Unix-Managers Archive  
   Archives of the Tru64-Unix Managers mailing list.
   http://aa11.cjb.net/tru64_unix_managers/

First Edition Unix Manual  
   The original Unix users manual.
   http://cm.bell-labs.com/cm/cs/who/dmr/1stEdman.html

Remote Control of UNIX Netscape Browsers  
   
   http://home.netscape.com/newsref/std/x-remote.html

Unix Filesystem  
   Description of how the filesystem works internally.
   http://www.angelfire.com/myband/binusoman/Unix.html

Unix and Linux Commands  
   Basic as well as more obscure commands for Unix/Linux operating systems.
   http://www.laynetworks.com/users/webs/linux.htm

Understanding Unix Concepts  
   Conceptual discussion of Unix and Unix-like operating systems.
   http://www.uwsg.iu.edu/usail/index/concepts.html

Intermediate Unix  
   Review of shell use, and overview of useful utilities.
   http://www.ceas.rochester.edu:8080/CNG/docs/InterUnix.html

Unix Help Files  
   Searchable database from U-Texas.
   http://wwwhost.cc.utexas.edu/cc/services/unix/index.html

Unix for Advanced Users  
   Description of startup/shutdown, process management and memory management.
   http://www.uwsg.iu.edu/UAU/uau.html

Unix Sysadmin Guide  
   Description of Unix internals.
   http://wks.uts.ohio-state.edu/sysadm_course/html/sysadm-1.html

pyttymon  
   A simple daemon that monitors and limits usage of ttys. It is implemented in Python. A simple config file can specify monthly, daily, session, and idle limits based on tty, user, group, and ttys in use.
   http://freshmeat.net/projects/pyttymon/

UNIX Signals and Process Groups  
   A short survey of UNIX signal handling and process groups, both conceptually and with interface descriptions. Compares System V Release 3, System V Release 4, BSD, and POSIX variants.
   http://world.std.com/~jimf/papers/signals/signals.html

Online Single Unix Specification  
   Ordering page for the Open Group's Single Unix Specification.
   http://www.unix.org/online.html