The filter sed can process text from standard input and write its results to standard output. The input can be redirected from a file, and the output also can be redirected to a file using your ...

The only thing wrong with sed is that most of us barely grasp how powerful it is. We use it in pipes to change "this" to "that", but we rarely consider it for the big editing jobs where it could save ...

The person that has to figure out why your scripts are broken will thank you. It's good to know the syntax of sed/awk for those (hopefully rare) cases where you don't have a more evolved scripting ...