Sed is a powerful editing tool, but difficult for most modern computer users to grasp. We'll cover some of the basics here so that you can understand it when you see it in a script.
Soon we'll talk about perhaps the most powerful programmable filter ever conceived (the scripting language AWK), but first let's look at a few other common filters and their uses.
The filter more is a program that lets us print output one screen at a time. If you've ever run a diff between two files or