a collection of Unix/Linux/BSD commands and tasks
Felix von Leitner's original paper on BSD and Linux io performance.
Dan Kegel's updated paper on high-performance network io programming on Unix.
The Linux Hater's Blog. Great fun, "in a way that xkcd is funny to Unixers. Whoever is writing that blog has extensive experience on Linux and enviable writing skills." --Miguel de Icaza
This google-interface behaves similar to a unix-shell. You type commands and the results are shown on this page.
web-based source code browser for historic unix versions with comments from the gurus
web-based source code browser for current and historic unix versions
old bug but still threre: looks like php code can take over any file descriptors, including apache's listening socket
Some hackers have too much time. This one has re-implemented the classic Unix command line editor vi in Javascript. (via hugo)