fedora and GNU GRUB

[Gregorio Canelos]

Hello Everyone,
 
I'm new to fedora core 4 and this list.   I got my hands dirty pretty 
fast, and now I can't get the dirt off......
That is,   I somehow ended up in the GRUB command-line after rebooting, 
after an uninstall of rehmudi packages.   I don't know GRUB and can't 
really follow the GRUB how-to's. .  .  What's the command to boot up 
with the linux partition?

Thanks,
Gregorio