What Is SED and How Do You Use It?

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sed stands for stream editor and is a commonly-used command in Linux/Unix. The name comes from a portmanteau of those two words. It’s not a text editor, though it does modify text. Instead, sed receives text input as a “stream” and edits the stream according to your instructions. By and large, people use sed as a command line version of find and replace. The main command in the program is used to substitute one character string for another. This makes it useful for running find and replace functions on a batch of files, but it is not as easy to

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