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System V InitScript
System V style init script links can be found in /etc/rcN.d/NNname whose target is the script /etc/init.d/name.These links are run by init when it changes runlevels
CentOS
# chkconfig smartd off # chkconfig irqbalance off # chkconfig microcode_ctl off # chkconfig cpuspeed off
disable gdm
vi /etc/inittab and change 5 to 3
Ed/X/Ubuntu 8+
# update-rc.d -f gdm remove
REFERRERS
InitScript
InstallCentos