How can I recursively delete all files of a specific extension in the current directory?

Use it with precaution. Run first:

find . -name "*.out" -type f

Use find:

find . -name "*.out" -type f -delete

 references:

1. https://askubuntu.com/questions/377438/how-can-i-recursively-delete-all-files-of-a-specific-extension-in-the-current-di