SSH is one of those technologies where once you get accustomed to using it, you'll wonder how you ever lived without it. The Linux shell is very powerful, and the power is magnified when you're able to access a system remotely. With remote access software, the user will typically see the mouse cursor move around the screen as you access the machine, causing them to stop working until you're finished with your connection. With SSH, you can actually connect to a system and not disturb the person sitting in front of it. To further illustrate the benefit of SSH, imagine that a family member or friend asks you to install FileZilla on their machine so that they can access an FTP site. You can get up, walk over to the machine, disturb the person, and install FileZilla, or you can obtain remote shell access and enter sudo apt-get install filezilla on their machine command in the background, without disturbing them. This is especially useful if you're not in the same physical...