chkconfig

chkconfig can control service startup
chkconfig --list displays all(most) daemons & status
chkconfig --list DAEMON displays a single daemon's status
to use chkconfig to turn off sendmail in level 3:
chkconfig --level 3 sendmail off
to use chkconfig to turn off sendmail in levels 3,4 & 5:
chkconfig --level 345 sendmail off
to turn on sendmail for level 4 & 5:
chkconfig --level 45 sendmail on
requires that the startup script exist in /etc/rc.d/init.d/