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If you've administered any remote Linux machines, then you're probably already familiar with SSH. As you may know, SSH provides secure, encrypted network communication. Utilities like ssh and sftp, which are based on SSH, protect remote login sessions and file transfers, respectively, and have largely subsumed similar but insecure and unencrypted utilities such as ftp, rlogin, rsh, rcp, and telnet. (In fact, if any of your systems still use telnet, put down this magazine at once, go disable telnet, install and enable SSH, and then continue reading.)
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