In this chapter, we have seen how we can extend sed into some very cool scripts that have allowed us to extract data from files, uncomment selected lines and write new configurations. Not stopping at that we also saw how we could use sed with script that inserts new lines into existing files. I thought that sed will very quickly become your friend and we have created some powerful scripts to support the learning experience.

You may already know this but sed has a big brother awk. In the next chapter, we are going to see how we can use awk to extract data from files.