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Cc: freebsd-questions@freebsd.org
Subject: Re: Lacky Doc @ "5.6.2 Using XDM"
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> You have just about any right in single user mode. Type
> chmod 644 /etc/ttys
> If you edit the file using vi and it isn't writable you can force to
> write to it by typing :w!

Not if his FS is mounted read-only.

Sure, he can remount it read-write, if he knows how :)
(Someone else already posted those instructions;
no need to repeat them here.)