having root on server, add user's public key to his keys (no password required)

cat user_public_key.pub | ssh root@<host> "cat | su -c 'mkdir -m 700 -p ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys' <user>"

-2
By: noisy
2016-05-09 08:48:40

2 Alternatives + Submit Alt

What Others Think

First of all, this requires SSHD to be running with PermitRootLogin Yes in /etc/ssh/sshd_config which is off by default on most servers these days. People use sudo for best practice or just su - at least. This command looks a little dangerous. I don't have a sandbox server/VM to test it on at the moment but it looks like you'd want to specify ~USER/.ssh/authorized_keys instead of ~/.ssh/authorized_keys. Same for ~user/.ssh/authorized_keys of course. I think you might have the order of parameters mixed up. You have to do su -c ... NOT su -c ...
sonic · 122 weeks and 6 days ago
Oh right, this reads HTML.. you have to do: su - user -c .. not su -c ... user
sonic · 122 weeks and 6 days ago
too many cats
mpb · 120 weeks and 3 days ago
(or her keys)
trissypissy · 119 weeks ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands



Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: