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$ man init
SYSTEMD(1) systemd SYSTEMD(1)
NAME
systemd, init - systemd system and service manager
SYNOPSIS
systemd [OPTIONS...]
init [OPTIONS...] {COMMAND}
DESCRIPTION
systemd is a system and service manager for Linux operating systems. When run as first
process on boot (as PID 1), it acts as init system that brings up and maintains userspace
services.
For compatibility with SysV, if systemd is called as init and a PID that is not 1, it will
execute telinit and pass all command line arguments unmodified. That means init and
telinit are mostly equivalent when invoked from normal login sessions. See telinit(8) for
more information.
When run as system instance, systemd interprets the configuration file system.conf,
otherwise user.conf. See systemd-system.conf(5) for more information.
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richard@h61h2mx16:~
$ man sysvinit
No manual entry for sysvinit
richard@h61h2mx16:~