ssh-keygen -t rsa
(just choose the default options. let the passphrase blank, or else you have to enter the passphrase everytime you login. this should generate /home/localuser/.ssh/id_rsa.pub)
2. Login to remote machine
3. Create file /home/remoteuser/.ssh/authorized_keys (if .ssh folder doesn't exists then create it, and if authorized_keys file is exists then use it)
4. Copy the contents of id_rsa.pub on local machine to authorized_keys file on remote machine
scp .ssh/id_rea.pub remotehost:.ssh/authorized_keys
scp .ssh/id_rea.pub remotehost:.ssh/authorized_keys
5. Run ssh-add on local machine, then you can run: "sftp remoteuser@remotehost" without password
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