[Q] how to edit file when in "repair filesystems"???

[mcclnx mcc]

Due to mistake change /etc/fstab.  When Redhat AS 3.0
bootup, it stop in middle and asked me login as "root"
to fix it.

when I tried to vi /etc/fstab, it show "read ONLY".  I
can NOT change it.  does there has way to edit file on
"repair filesystem" mode?

Thanks.

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