On FreeBSD, OS X but not on Linux, C-T sends SIGINFO which produces information of the current process. Other interesting articles on the blog include
https://blog.danielisz.org/2017/03/18/the-unix-system-family-tree-research-and-bsd/
https://blog.danielisz.org/2018/02/10/raspbsd/
https://danielisz.wordpress.com/2018/02/11/raspberry-pi-and-freebsd/

Interesting software, such as
unifdef selectively removes C preprocessor conditionals. My version of this program now shipped by all the BSDs (including Mac OS X) and is used by the Linux kernel build system.
regpg safely stores server secrets using gpg, so you can keep them in version control.
picoro - tiny coroutine implementations in pure C. I wrote an accompanying article, coroutines in 20 lines of standard C.
Counting the days - tiny routines for converting Gregorian dates into linear counts, like Julian day numbers or Unix time_t. The date of the count - a small routine for converting linear day counts into Gregorian dates.
https://dotat.at/@/2016-04-22-synergy-vs-xmodmap-fight.html Why you can't use xmodmap to change how Synergy handles modifier keys
https://dotat.at/@/2023-05-26-whence-time.html Where does my computer get the time from?
https://dotat.at/@/2023-08-04-unix69.html a neat keyboard map
https://dotat.at/@/2024-01-29-four-point-egg.html construct an egg shape with straightedge and compass
His log of links, https://dotat.at/:/ which I found on the TUHS mailing list is also worth reading. He explains a bit about this log on http://dotat.at/.

Simple example of getopts.
There are a number of interesting articles on https://notes.neeasade.net/, e.g.
https://notes.neeasade.net/mobile-capture-with-orgzly-termux-and-syncthing.html

Enjoy the various programming-themed writings available on offer. The latest post is available below and the archive link is directly above this text.

Joe Marshall's non-lisp blog. Lisp/Scheme are the subject of his other blog,
Abstract Heresies, Unorthodox opinions on computer science and programming. http://funcall.blogspot.com/

Review of
Eyles, Don. Sunburst and Luminary. Boston: Fort Point Press, 2018. ISBN 978-0-9863859-3-3.
http://www.sunburstandluminary.com/SLhome.html

The next blog entry is interesting as well.
https://www.fourmilab.ch/fourmilog/archives/2019-11/001848.html
Crossfield, Albert Scott and Clay Blair. Always Another Dawn. Seattle, CreateSpace, [1960] 2018. ISBN 978-1-7219-0050-3.

Running emacs on a remote machine via a web interface.

Article describing how to plot with Python, Matplotlib & Pandas.

Vladimir Sedach explains how to establish a lisp machine keyboard layout under X11. He mentions that keycaps with the right symbols have been made.

Overview of old unix versions which can be run on simulated (or real) pdp-11 computers.
The UNIX-HATERS Handbook, a review on https://athornton.dreamwidth.org/14272.html is also worth reading.

See also his ANCIENT COMPUTER MVSEVM on https://mvsevm.fsf.net/
If you want an account on one of these systems, please email Adam Thornton <athornton@gmail.com> and ask.
All systems are emulated, on Raspberry Pi and Linux.

1: Multics MR 12.6f (Honeywell 6800 DPS-8/M)
2: TOPS-20 7.1 (PDP-10 KL-10)
3: TOPS-10 7.03 (PDP-10 KA-10)
4: ITS (PDP-10 KA-10)
5: OpenVMS 7.3 (MicroVAX 3900)
6: Unix v7 (PDP-11/70)
7: Unix 2.11bsd (PDP-11/70)

Announced on the TUHS mailing list. https://www.tuhs.org/pipermail/tuhs/2019-August/018253.html