edit/write the /etc/fstab file 

I comment out some vol group in fstab accidentally.
I also comment the swap space in /etc/fstab 
But I cannot edit /remove it back by using vi /etc/fstab again in init 1 and init 6 .
The file system /etc/fstab is read -only . I cannot chmod .....
What can I do in order to recover it?

Solution:

Manually remount the appropriate filesystem as read-write. An example from man mount:

Code:

mount -o remount,rw /dev/foo /dir

or

Reboot the system, and pass this as an additional kernel parameter 
(attention: at this point an english keyboard layout is in effect) 

Code:

init=/bin/sh

When you've booted to an console, enter this: 

Code:

mount / -oremount,rw
vi /etc/fstab
# after editing, just to be sure
sync

Revert your changes, and reboot the system using either 'reboot' or by doing a cold reboot. 

Note: 'shutdown' won't work at this point.

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