cannot edit /etc/fstab in single mode

Problem :

I added one of no use syntax in /etc/fstab and  after reboot to single mode and then use vi to edit /etc/fstab that display this file
is read-only mode, so I cannot edit it ….. now I cannot go back to  normal boot up.

Solution :

In Single user mode type the following ,

mount -o remount,rw /

Then vi /etc/fstab and then you will be able to amend the file again .