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UNIX Boot Mode – Run Levels

Runlevel “3” will boot to text or console mode and “5” will boot to the graphical login mode ( “4” for slackware)

Runlevel Scripts Directory
(Red Hat/Fedora Core) State
0 /etc/rc.d/rc0.d/ shutdown/halt system
1 /etc/rc.d/rc1.d/ Single user mode
2 /etc/rc.d/rc2.d/ Multiuser with no network services exported
3 /etc/rc.d/rc3.d/ Default text/console only start. Full multiuser
4 /etc/rc.d/rc4.d/ Reserved for local use. Also X-windows (Slackware/BSD)
5 /etc/rc.d/rc5.d/ XDM X-windows GUI mode (Redhat/System V)
6 /etc/rc.d/rc6.d/ Reboot
s or S
Single user/Maintenance mode (Slackware)
M
Multiuser mode (Slackware)