If you want to setup SSH keys to allow logging in without a password, you can do so with a single command. It’s quite easy.
The first thing you’ll need to do is make sure you’ve run the keygen command to generate the keys (if you have already generated keys, skip this step).
ssh-keygen -t rsa
Then use this command to push the key to the remote server, modifying it to match your server user name and host name.
cat ~/.ssh/id_rsa.pub | ssh user@hostname 'cat >> .ssh/authorized_keys'
You’ll have to enter your password the first time to copy the keys. After that, you should be able to login without a password, or even use scp or rsync without entering a password. You can test with this command:
ssh user@hostname
It’s definitely a lot easier than typing in a password all the time.
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by The Geek via How-To Geek
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