[cbolton]

I think systemd is the one to learn now if you want to learn Linux. Maybe someone can make a Unix from Scratch for people more interested in the Unix philosophy than Linux per se.

[cbmuser]

SysVInit on Linux isn’t true Unix though as the way it abuses runlevels to start daemons was never intended by the original designers of init.

[roryirvine]

Yeah, people forget the degree to which sysvinit was hated at the time - "why are you forcing me to deal with an impenetrable forest of symlinks rather than simply hand-edit a couple of basic rc scripts?!?".

If the intention is to create a system that users can reason about, then sysvinit offers the worst of all possible worlds.

[jeroenhd]

systemd is most certainly the most pragmatic service to learn, but if you're doing LFS to "learn" how a Linux system gets brought up, something lower-level may be a better idea to pick up.

[prmoustache]

All this stuff is versioned anyway so if the point is learning youe can still read an old version of the book and use old versions of the repos.