Unix System V-style implement conventionally 7 runlevels. This runlevel implementation varies across many Linux distribution. Usually runlevel 0, 1 and 6 are the same.
0 - halt
1 - single mode
6 - reboot
On Debian distributions runlevel 2-5 are dedicated to full multi-user mode with graphical managers and console login. Redhat/Fedora has two separate runlevels for each mode. To check the runlevel, you can use the runlevel comm...
By kevin, June 26, 2015