unix

http://lists.w3.org/Archives/Public/www-style/2014Mar/0272.html The complete history of the X Windows color list.

http://www.tedunangst.com/flak/post/signal-safe-strcpy POSIX forbids using strcpy in signal handlers. Here's how to get around that.

http://devnull-as-a-service.com/ Outsource your null device.

http://retrobsd.org/wiki/doku.php RetroBSD is a port of 2.11BSD to microcontroller hardware.

http://lwn.net/Articles/528935/ Al Viro on how signals are handled during syscalls in Linux.

http://www.lemis.com/grog/Documentation/Lions/index.php The famous Lions' Commentary on UNIX is available for free online. Wikipedia.

http://www.brendangregg.com/specials.html An enormous collection of useful tools for UNIX system administration!

http://osxbook.com/software/ancientfs/ Mount ancient UNIX filesystems on MacOS X!

http://www.shell-fu.org/index.php UNIX shell tips and tricks.

http://magazine.redhat.com/2008/02/07/python-for-bash-scripters-a-well-kept-secret/ Using Python's subprocess module to write shell scripts in Python.