Copy ssh Public key to Server in one line

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.

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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.

Don't abuse the cat like that!

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"

thanks for key, bookmarked

This is the method I usually use:
ssh-copy-id user@remote.server.com

OMG, that's so awesome. Thanks.

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

Awesome tip. Was having issues with ssh-copy-id, this worked first time.

Thanks for the command lines :)

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

ssh-copy-id -i /path/to/id_foobar.pub "-p 2222 user@server"

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.

Great tip. Thank You.

Can anyone shed some light on how the command works?

Thanks!

One liner is really handy as ssh-copy-id is not available mac!

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