When I use the Linux command line, whether I’m writing a new program on my desktop computer or managing a website on my web server, I often need to process text files. Linux provides powerful tools that I leverage to get my work done. I frequently use sed, an editor that can modify text according to a pattern. sed stands for stream editor, and it edits text in a file and prints the results.

Source: LXer – How I use the Linux sed command to automate file edits