How to change permissions of rc.sysinit in run level 1
While playing with my Linux box, I edited rc.sysinit in /etc/rc.d/ folder. But now when I boot into run level 3 or 5, I get complain that system cannot run /etc/rc.d/rc.sysinit.
I boot into run level 1, and checked its permissions, which is rw-r--r-- . It should be rwxr-xr-x.
I tried to use chmod to change its permissions, but it responded that "Read Only file system"
Now how can I change its persmissions when in run level 1. In run level 3 and 5, machine does not boot.
My box has Fedora Core 2 with kernel 2.6.20.
Any hint, suggestion or solution will be highly appreciated.