the.com/init systems
the first program your computer runs, and the last one it should ever crash.
means the init system is process id 1, the ancestor that boots everything else and adopts every orphaned process after.
from unix needed something to run first after the kernel loads, so bell labs named it init in the 1970s and gave it pid 1 forever.
pid 1 privilegekernel refuses to let it die easily
systemd fightdebian's 2014 vote nearly split the project
orphan adoptioninit inherits any process whose parent dies
macos cousinlaunchd replaced init entirely in 2005