init

init is the command that starts and loads drivers for the kernel. It uses

6 different run levels to provide options.

0 halt

1 single user mode, used for emergency recovery

2 multiuser, command line, not network

3 multiuser, command line with network

4 not used

5 Graphical User Interface, multiuser

6 reboot

Example:

init 0

This will halt the system.

init 6

This will reboot the system.