SSH is a secure remote login program. It lets you login and access a remote computer, often a Linux system, using your own desktop/laptop computer from home or anywhere you can get on the Internet.
SFTP is a secure file transfer program that allows you to upload and download files to and from another computer.
From a Linux computer you can use the ssh and sftp commands that come with your system. See Chapter 7 for how to set up these programs for secure communication and file transfer.
From a Mac OS X, you can use the Terminal application to get to a Shell window. Then, you can use the commands ssh and sftp just like on Linux systems.
Also, Mac OS X users may prefer the secure file transfer program Fugu.
After installing SSH you can login to any Linux computer where you have an account.
For more information, see this SSH guide (from Ohio State University) for download, installation, and usage instructions for SSH/SFTP.
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