I'm trying to have an unattended remote PC log some data on home PC.
man sshd says I should be able to put a command in authorized_keys.
This is what I have on the remote machine. The key is a special key that isn't used elsewhere.

In my ~/.ssh/authorized_keys file on my desktop:

Code:

command="/bin/cat >> /home/ken/text/limited.log" ssh-dss AAAAB3Nz ...

Then to write the data, I issue this command on the remote machine, where desk_pc is the IP of my desk PC:

Code:

echo "$(date +%D)  Data ...." | ssh -x -i ~/.ssh/special_id_dsa desk_pc

I think this should work, but it doesn't.
I think my desktop it's trying execute the received text instead of cat it to the log file. This is displayed on the remote machine:

Code:

Pseudo-terminal will not be allocated because stdin is not a terminal.

-bash: line 1: 07/09/11: No such file or directory

Do I need a pty? How can I get stdin written to a file without a pty if I need one?
How do I get it to execute the /bin/cat command, not the received text?