Using sed to perform text replacement

- [Instructor] Hello again and welcome to the next video…of section four, using sed to perform text replacement.…In the previous video we have learned about cutting…a file column-wise with cut.…This video will cover most of the frequently…used sed techniques.…Sed stands for stream editor, it's a very essential tool…for text processing and a marvelous utility…to play around with regular expressions.…A well known usage of the sed command…is for text replacement.…Let's see how to do it.…Sed can be used to replace occurrences…of a string with another string in a given text.…

It can be matched using regular expressions.…This command reads from standard in.…If you're using the vi editor you'll notice…that the command to replace text is very similar…to the one discussed here.…By default sed only prints the substitute text,…to save your changes along with your substitutions…to the same file use the minus I option.…Most of the users follow multiple redirections…to save the file after making a replacement as follows.…

However, it can be done in just one line.…