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While working on remote machine we often get headache of entering password for ssh login, scp files from one server to another server. Adding public key as authorized_keys on remote server solves this problem.
Copying from my system to remote server cat ~/.ssh/id_rsa.pub | ssh sandip@server 'cat >> ~/.ssh/authorized_keys' Copying from remote server to my system
ssh server 'cat ~/.ssh/id_rsa.pub' | cat >> ~/.ssh/id_rsa_client.pub