If you want to execute a command on all filtered files, it can be very easily done with the command find.

For example, we could change all our files to have the yml extension:

find . -type f -exec mv '{}' '{}'.yml \;

Deleting all files with a given name is extremely easy and useful for project cleanups

find . -name "<filename>" -delete

Or the equivalent

find . -name "<filename>" -exec rm '{}' \;

I find this to be very close to the xargs command but simpler.