This page used to have a lot more on it, mainly Linux stuff. However, lately I've been moving servers over to OpenBSD and their man pages are so well-written that I haven't had much use for this web page. I'm still going to add things here when I need to, though. Maybe I'll write a diatribe about how GNU software seems to be programmed in an intentionally Byzantine manner. I mean, have you ever tried to use an "info" document? No, of course you haven't. Nobody actually uses those.
This has nothing to do with systems administration, but I'm putting it here so I don't forget it. Here is how to use ffmpeg to convert an mpeg4 video to H265/Matroska, with sound:
ffmpeg -i input.mp4 -vcodec libx265 -c:a copy output.mkv
To suspend output to the terminal, hit Ctrl-S. To resume, hit Ctrl-Q. I put this on the page because from time to time I accidentally hit Ctrl-S, and this is a better solution to fixing the problem than killing the terminal and starting another one.