Limited generic way to replay in slow motion
You can use
script to record
script -O typescript -T typescript.timing -c 'htop -t'
script will exit just after
htop exits. Alternatively:
script -O typescript -T typescript.timing
puts you in a shell where you can run
htop -t and/or whatever. In this method it's important to
exit the shell; only then
script exits, you can replay in slow motion:
scriptreplay typescript.timing typescript 0.1
script records what happens in a terminal session. In your case it does not really record the process tree. It records what
htop prints and it so happens it prints the tree. But if
htop does not show you some process (because it's transient or you're just scrolling through the wrong part of the tree) then
scriptreplay won't show the process either. Consider
htop -t -d 1 to make transient processes more likely to be seen. Anyway
htop is by no means a reliable way to audit processes in your OS. I mean you can and will miss out on some processes.
What happens in a terminal session depends on the size of the terminal. Playing it back in a terminal of a different size (especially if smaller in any direction) may cause misalignments, artifacts and such. Resizing the terminal during playback may cause additional artifacts.
If you interrupt
scriptreplay with Ctrl+c then you may need to run
reset or in another way bring your terminal to a sane state.
scriptreplay is not interactive, one cannot even pause it. I have found
scriptreplay_ng, it seems somewhat better in this aspect; but I haven't tested.