ssh-keygen command

I recently read that SSH keys provide a secure way of logging into a Linux and Unix-based server. How do I set up SSH keys on a Linux or Unix based systems? In SSH for Linux/Unix, how do I set up public key authentication?

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My cloud based backup service provider has ssh access to the backup system. How do I install and configure duplicity software for remote backups in incremental and encrypted format on Debian or Ubuntu Linux based desktop / laptop / server?

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I‘m using cloud files from Rackspace to store files in cloud. I know how to use ftp client with cloud files, but I would like to use Secure File Transfer Program, sftp on the command line, a true SSH File Transfer Protocol client from the OpenSSH project for security and privacy concern. How do I install sftp-cloudfs under Linux or Unix like operating systems?

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How do I install my SSH public key ~/.ssh/id_rsa.pub onto a remote Linux and UNIX server automatically from Linux workstation or Apple OS X laptop without using scp and/or copy & paste method?

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How do I generate ssh RSA keys under Linux operating systems?

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How do I generate ssh keys under Linux / UNIX / Mac OS X and *BSD operating systems for remote login?

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