It is not uncommon to have to apply similar changes to a set of many
different files. For example, a programmer might want to insert some
license text on top of each source file of a project. Or one might want
to update the copyright notice on all pages of a static website.
Doing such tasks by hand would be terribly time-consuming ... and awfully
boring. Fortunately, when working with text files, the standard Unix tool
chest has all that is required to automate that work.
In this video, I will use one of the most versatile non-interactive text
sed Stream Editor.