Originally posted by Brian1
What to do is edit /boot/grub/grub.conf and remove each kernel section you don't what. Recommend to keep current and one old one (usually the default installed one ). Then /boot remove the vmlinuz, initrd, and system.map that match the kernels you removed from grub.conf. Now goto /lib/modules and remove match version number folders to kernel you selected earlier. That takes care of 99.99% of the items to gain back the space.
" Google the Linux way @ http://www.google.com/linux "
You can do the same thing much easier with:
as the superuser,
# rpm -q kernel
That lists all versions of the kernel that are installed. To remove the older version kernel:
# rpm -e kernel-2.6.10-1.760_FC3
kernel-2.6.10-1.760_FC3 must be typed in exactly as it appears in the rpm -q listing. In fact, it is best to use copy/paste for the kernel version.
That will do everything (and possibly more) that Brian1 said to do in one easy step