This seems to work:
/usr/bin/dnsshell:

#!/bin/sh
umask 755
echo $2 > /tmp/tmpfile

Basically, I do dns hosting for a few people, and when their IP changes, I
want to give them a way to let me know of the change so I can update their
records, but without giving them an full account.
ssh account@my_machine.com new_ip_address
with the above as a shell does the job, and there's no way (that I've
discovered) to acutally log in.

The seventh rule of Fight Club is: Fights go on as long as they have to.

// Erik Huizing   huizing@cpsc.ucalgary.ca
// www.cpsc.ucalgary.ca/~huizing

On Thu, 11 Oct 2001, Curt Sampson wrote:

> On Wed, 10 Oct 2001, David Brownlee wrote:
>
> > 	    ssh -l copyuser some.host.com '`ls /etc| Mail bob@there`'
>
> It would write to a file called
>
>     `ls /etc| Mail bob@there`
>
> wouldn't it? After all, the backquotes only appear *after* $1 has been
> expanded, at which point there's no more work being done:
>
>     $ x='`echo bar`'
>     $ echo "$x"
>     `echo bar`
>
> > 	Could also write outside $tapedir using '..'
>
> Mmm...good point. I should probably fail if any slashes or initial
> periods are detected.
>
> cjs
> --
> Curt Sampson  <cjs@cynic.net>   +81 3 5778 0123   http://www.netbsd.org
>     Don't you know, in this new Dark Age, we're all light.  --XTC
>
>