Volunteer experts answer your questions about Unix.

Unix tutorials, exercises and resources. Features on-line tests and training materials.

The original Unix users manual.

Review of shell use, and overview of useful utilities.

Ordering page for the Open Group's Single Unix Specification.

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.

Conceptual discussion of Unix and Unix-like operating systems.

Basic as well as more obscure commands for Unix/Linux operating systems.

Description of how the filesystem works internally.

Description of startup/shutdown, process management and memory management.

Brian Kernighan's 1979 classic introduction to the facilities Unix offers, from the 7th Edition manual.

Searchable collection of articles and guides for Unix administrators and power-users. Offers materials on all major and many minor distributions.

Searchable database from U-Texas.

Brief Unix tutorial, online man pages and reference materials for the Unix operating system and common Unix utilities.

Source material from Bell Labs.

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.

Description of Unix internals.

Online book; GUI, editors, awk, perl, C, C++, make, roff, security, HTML, MIME, CGI, RCS, CVS, SCCS, FAQs.

Help site and portal documenting all major Unix distributions.