Tree-sitter is really powerful, but it's worth people learning a few methods they prefer to use because there are going to be situations where one method works better than another. Things I have found useful in the past include

- perl -pi -e 's/foo/bar/g' files

"-pi" means "in place edit" so it will change the files in place. If you have a purely mechanical change like he's doing here it's a very reasonable choice. If you're not as much of a cowboy as I am, you can specify a suffix and it will back the files up, so something like

perl -p -i.bak -e 's/db/database/g' py

For example then all your original '.py' files will be copied to '.py.bak' and the new renamed versions will be '.py'

For vim users (I know emacs has the same thing but I don't remember the exact invocation because it has been >20years since I used emacs as my main editor) it's worth knowing the "global" command. So you can execute a particular command only on lines that match some regex. So say you want to delete all the lines which mention cheese

:%g/cheese/d

Say you want to replace "db" with "database" but only on lines which start with "def"

:%g/^def/s/db/database/

OK cool. Now if you go 'vim *py' you can do ":argdo g/^def/s/db/database/ | update" and it will perform that global command across all the files in the arg list and save the ones which have changed.