The program systemd is the process with process ID 1. It is responsible for initializing the system in the required way. systemd is started directly by the kernel and resists signal 9, which normally terminates processes. All other programs are either started directly by systemd or by one of its child processes.
Systemd is the first process that is started by the kernel during boot. It has the process ID of 1. It is responsible for initializing and managing other processes and services on the system. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-systemd-basics.html#sec-systemd-intro
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