Process enabling

There are a large number of processes that can be enabled or disabled at various ``run levels''. Run levels are stages of system booting that start various processes. The levels exist because certain processes require other to exist before they start. For instance, you can't start networking programs until the network is started. But you can't start the network until the network driver is loaded. But you can't load the network driver until you detect the hardware.

Linux systems generally run in either level 3 or level 5. Level 3 is a ``console mode''. That is, it presents a single console to the user. Level 5 is ``X mode''. That is, the user interface is generally X or some other GUI handling program.

There is a command ``chkconfig -list'' which will show you all of the processes and the level at which they are on or off.

bash-2.05b# chkconfig --list 
kudzu          	0:off	1:off	2:off	3:on	4:on	5:on	6:off
syslog         	0:off	1:off	2:on	3:on	4:on	5:on	6:off
netfs          	0:off	1:off	2:off	3:on	4:on	5:on	6:off
network        	0:off	1:off	2:on	3:on	4:on	5:on	6:off
random         	0:off	1:off	2:on	3:on	4:on	5:on	6:off
rawdevices     	0:off	1:off	2:off	3:on	4:on	5:on	6:off
pcmcia         	0:off	1:off	2:on	3:on	4:on	5:on	6:off
saslauthd      	0:off	1:off	2:off	3:off	4:off	5:off	6:off
keytable       	0:off	1:on	2:on	3:on	4:on	5:on	6:off
apmd           	0:off	1:off	2:on	3:on	4:on	5:on	6:off
atd            	0:off	1:off	2:off	3:on	4:on	5:on	6:off
gpm            	0:off	1:off	2:on	3:on	4:on	5:on	6:off
autofs         	0:off	1:off	2:off	3:on	4:on	5:on	6:off
iptables       	0:off	1:off	2:off	3:off	4:off	5:off	6:off
irda           	0:off	1:off	2:off	3:off	4:off	5:off	6:off
isdn           	0:off	1:off	2:off	3:off	4:off	5:off	6:off
sshd           	0:off	1:off	2:on	3:on	4:on	5:on	6:off
portmap        	0:off	1:off	2:off	3:on	4:on	5:on	6:off
nfs            	0:off	1:off	2:off	3:off	4:off	5:off	6:off
nfslock        	0:off	1:off	2:off	3:on	4:on	5:on	6:off
sendmail       	0:off	1:off	2:off	3:off	4:off	5:off	6:off
rhnsd          	0:off	1:off	2:off	3:on	4:on	5:on	6:off
crond          	0:off	1:off	2:on	3:on	4:on	5:on	6:off
anacron        	0:off	1:off	2:on	3:on	4:on	5:on	6:off
httpd          	0:off	1:off	2:off	3:off	4:off	5:off	6:off
aep1000        	0:off	1:off	2:off	3:off	4:off	5:off	6:off
bcm5820        	0:off	1:off	2:off	3:off	4:off	5:off	6:off
squid          	0:off	1:off	2:off	3:off	4:off	5:off	6:off
tux            	0:off	1:off	2:off	3:off	4:off	5:off	6:off
winbind        	0:off	1:off	2:off	3:off	4:off	5:off	6:off
smb            	0:off	1:off	2:off	3:off	4:off	5:off	6:off
xfs            	0:off	1:off	2:on	3:on	4:on	5:on	6:off
xinetd         	0:off	1:off	2:off	3:on	4:on	5:on	6:off
cups           	0:off	1:off	2:on	3:on	4:on	5:on	6:off
named          	0:off	1:off	2:off	3:off	4:off	5:off	6:off
ntpd           	0:off	1:off	2:off	3:off	4:off	5:off	6:off
firstboot      	0:off	1:off	2:off	3:off	4:off	5:off	6:off
snmpd          	0:off	1:off	2:off	3:off	4:off	5:off	6:off
snmptrapd      	0:off	1:off	2:off	3:off	4:off	5:off	6:off
pxe            	0:off	1:off	2:off	3:off	4:off	5:off	6:off
vsftpd         	0:off	1:off	2:off	3:off	4:off	5:off	6:off
yppasswdd      	0:off	1:off	2:off	3:off	4:off	5:off	6:off
ypserv         	0:off	1:off	2:off	3:off	4:off	5:off	6:off
ypxfrd         	0:off	1:off	2:off	3:off	4:off	5:off	6:off
dhcpd          	0:off	1:off	2:off	3:off	4:off	5:off	6:off
dhcrelay       	0:off	1:off	2:off	3:off	4:off	5:off	6:off
xinetd based services:
	chargen-udp:	off
	rsync:	off
	chargen:	off
	daytime-udp:	off
	daytime:	off
	echo-udp:	off
	echo:	off
	services:	off
	servers:	off
	time-udp:	off
	time:	off
	cups-lpd:	off
	sgi_fam:	on
	finger:	off
	rexec:	off
	rlogin:	off
	rsh:	off
	ntalk:	off
	talk:	off
	telnet:	off