Copy ssh Public key to Server in one line

Error message

The spam filter installed on this site is currently unavailable. Per site policy, we are unable to accept new submissions until that problem is resolved. Please try resubmitting the form in a couple of minutes.

Update (2011/02/06): you don't really need any of the commands below, you can just use the ssh-copy-id program that comes with ssh.

Here it is:

cat ~/.ssh/id_dsa.pub | ssh <a href="mailto:user@hostname">user@hostname</a> "cat - >> ~/.ssh/authorized_keys"

Apparently some people don't like this one that much. :-)

Here's an alternative:

ssh <a href="mailto:user@hostname">user@hostname</a> "echo `cat ~/.ssh/id_dsa.pub` >> ~/.ssh/authorized_keys"

It doesn't require the first cat or the pipe.

Tags: 

Comments

Nice one liner, if your using gentoo theres also a bash script that comes with ssh. /usr/bin/ssh-copy-id just in case you were unaware.

No I wasn't aware of that. Thanks. My main box is Gentoo. The particular one I was using was Ubuntu Server.

There's always scp, so no need to do whacky pipes.

scp ~/.ssh/id_dsa.pub <a href="mailto:user@hostname">user@hostname</a>:~/.ssh/authorized_keys

patrick, that only works if you don't mind wiping the authorized_keys file? I need to append a key while keeping the others.

Or if you want it to handle the directory and file maybe being there and maybe not (as well as still appending to existing ones):

cat ~/.ssh/id_rsa.pub | ssh user@hostname "mkdir -p ~/.ssh && touch ~/.ssh/authorized_keys && cat - >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys && chmod 700 ~/.ssh"

Just what I was looking for. It works just as you describe. The chmod permissions commands are a nice add.

Thanks for the command lines :)

You can't connect to non standard port with ssh-copy-id :(

If you are wanting to add your ssh key to a host to speed up logging into it then you should really have an entry in your ~/.ssh/config file:

Host machine1
 Port 2222
 User user1

This also works with sftp and scp, so makes your life much simpler.

Add new comment