you should have some sort of program like sysvinit, tkinit r some sort of "control center" where you can control that, but at a lower level, just do somethign like
ln -s /etc/rc.d/init.d/sshd /etc/rc3.d/S80sshd
assuming your normal runlevel is 3, if you boot straight to X, it'll be 5 instead. also there is chkconfig, which should do it aswell
chkconfig 35 sshd on
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