SED is powerful. It can, besides many other things, substitute, append, remove characters or groups of characters or whole lines in a text file or the console output. You may find it difficult to use, but here is an excellent web page that will help you get going:
Bruce Barnett writes in his article:
Sed is the ultimate stream editor. If that sounds strange, picture a stream flowing through a pipe. Okay, you can’t see a stream if it’s inside a pipe. That’s what I get for attempting a flowing analogy. You want literature, read James Joyce.
Anyhow, sed is a marvelous utility. Unfortunately, most people never learn its real power. The language is very simple, but the documentation is terrible. The Solaris on-line manual pages for sed are five pages long, and two of those pages describe the 34 different errors you can get. A program that spends as much space documenting the errors than it does documenting the language has a serious learning curve.
Do not fret! It is not your fault you don’t understand sed. I will cover sed completely. But I will describe the features in the order that I learned them. I didn’t learn everything at once. You don’t need to either.
A powerful command, SED by George Notaras is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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