System administration command. Signal init to change the system’s runlevel. telinit is actually just a link to init, the ancestor of all processes.
Send SIGKILL seconds after SIGTERM. Default is 20.
The default runlevels vary from distribution to distribution, but these are standard:
Halt the system.
Reboot the system.
Process only entries in /etc/inittab that are marked with runlevel a, b, or c.
Check the /etc/inittab file for runlevels on your system.