Yes, you can either add the command/script to your
/etc/rc.d/rc.local
file, which inits last before the login prompt/X server, or, to make it start via init, you can place a symbolic link in this directory:
/etc/rc.d/rcx.d
where x is the runlevel you usually boot into. If youre putting the symlink in as a part of init, be sure to give it this syntax:
Sxy
x=the priority number, lower comes first
y=simple name of the program/script.
Dont forget the S!
For example, one entry in my /etc/rc.d/rc3.d directory looks like this:
S73numlock
Good luck!