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Either ssh-agent or 'ssh -o' can be used:
$ ssh-copy-id -i .ssh/account_rsa localhost
account@localhost's password:
Now try logging into the machine, with "ssh 'localhost'", and check in:
~/.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
$ ssh-add ~/.ssh/account_rsa
Enter passphrase for /home/account/.ssh/account_rsa:
Identity added: /home/account/.ssh/account_rsa (/home/account/.ssh/account_rsa)
$ sftp localhost
Connected to localhost.
sftp>
$ ssh-add -D
All identities removed.
-----------------
$ sftp -o 'IdentityFile ~/.ssh/account_rsa' localhost
Enter passphrase for key '/home/account/.ssh/account_rsa':
Connected to localhost.
sftp>
Description of problem: The 'sftp' on RHEL6 doesn't have "[-i identity_file]" option: [root@sgi-xe250-02 ~]# sftp usage: sftp [-1Cv] [-B buffer_size] [-b batchfile] [-F ssh_config] [-o ssh_option] [-P sftp_server_path] [-R num_requests] [-S program] [-s subsystem | sftp_server] host sftp [user@]host[:file ...] sftp [user@]host[:dir[/]] sftp -b batchfile [user@]host Version-Release number of selected component (if applicable): [root@sgi-xe250-02 ~]# rpm -q --whatprovides /usr/bin/sftp openssh-clients-5.3p1-70.el6_2.2.x86_64 How reproducible: Always Additional info: [-i identity_file] is needed by kdump to provide password-less access via sftp.