Using /proc to get a process' current stack trace
Instead of teaching people how to do this portably across all UNIX-like systems, by sending SIGABRT to the process, the article is steeping them in GNU/Linux only way of doing things. This feels exactly like the '90's of the past century, where a lot of people with computer-related careers had no idea that there were other operating systems and other ways of doing things (better): an intel-based PC tin bucket with Windows was the one and only truth for them. Now it's exactly the same except Windows has been replaced with GNU/Linux. 28 years later and the only advancement some people have made is running the proverbial sed 's/Windows/Linux/g'.