Blimey, what on earth prompted you to type that...
Just boot up using a rescue disk (the first disk of any linux distro will probably work, a copy of of Knoppix, or a rescue floppy), mount your old system, and re-create a minimal /etc/fstab...
# /etc/fstab: static file system information.
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
/dev/xxx / ext3 defaults,errors=remount-ro 0 1
/dev/yyy none swap sw 0 0
/dev/hdc /media/cdrom0 iso9660 ro,user,noauto 0 0
Replace xxx and yyy with the appropritate partition abbreviations - sda1 and sda2 possibly, if you are using SCSI, or hda1 and hda2 for IDE disks.
Good luck !