I'm using Arch Linux. I have read about systemd, and as I understand it, systemd is the first process, and it starts the rest of the processes.
But when I use:
ps -aux
The result shows that /sbin/init has PID 1. And when I use:
pstree -Apn
The result shows that systemd has PID 1. Which is correct? Is /sbin/init starting systemd?