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Time, Clock, and Calendar Programming In C
Nice explanation of the various historical stages of development of the C time APIs.
to ag0803 api c calendar date posix time timing unix ... on 03 October 2014
A pretty fancy shell written in Go.
Xv6, a simple Unix-like teaching operating system
The teaching OS for MIT's operating systems course -- which is taught by Russ Cox, Frans Kaashoek and Robert Morris, so it's probably safe to say that the authors know what they're talking about! This is a cleaned-up Unix v6 -- contrast with v7x86, which is a modernised Unix v7.
Replacing a Unix userspace more-or-less from scratch, including a compiler, libc, and so on.
Includes CTSS, the precursor of Multics and therefore the grandfather of Unix. And it's surprisingly Unixy in some ways...
to 7090 ctss emulation ibm retrocomputing unix ... on 05 February 2014
Sandra Henry-Stocker | ITworld
"This blog offers advice for everyday Unix systems administration and some clever ways to approach more challenging problems." Lots of nice examples of how to string Unix tools together to do interesting things.
cliapp: Python framework for Unix command line programs
Unix patterns library for Python. I have something like this (but rather less sophisticated!) in misccode.
Proper handling of SIGINT/SIGQUIT
What shells and applications ought to be doing.
to programming shell sigint signal unix ... on 07 June 2013
How utmp and friends work across various Unix-likes.
to distribution posix sysadmin unix utmp ... on 04 June 2013
The Very Unofficial Commodore Amiga UNIX (AMIX) Wiki | HomePage
to amiga retrocomputing unix ... on 29 May 2013
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tasty by Adam Sampson.