authorized_keys options for remote forwarding

[Dan Kaminsky]

>
>
>command="/usr/bin/cat",no-X11-forwarding,no-agent-forwarding,\
>permitopen="ip1:port1",permitopen="ip2:port2" ssh-rsa AAAA...
>  
>
Doesn't this allow any file on the system to be read, or written to for 
that matter?

I tend to use either sleep, or a tiny app called sleepy that's the C 
equivalent of:

while [ 1 ] do echo $; sleep 5; done

--Dan