How to add RSA key to authorized_keys file?

Question

I\'ve created an RSA public key and I want to add that to authorized_keys file, but there is no such file in my Ubuntu 11.10 machine.

How can I add the key

Answer 1

>ssh user@serverip -p portnumber 
>sudo bash (if user does not have bash shell else skip this line)
>cd /home/user/.ssh
>echo ssh_rsa...this is the key >> authorized_keys