Remove and ignore all files that have an extension from a git repository

Plenty of ways to remove them:

git ls-files | grep '\.pwc$' | xargs git rm

find . -name *.pwc | xargs git rm

Note: If you haven’t committed them, just use rm, not git rm.

To ignore them in the future, simply add *.pwc to the .gitignore. (If you don’t have one, create a file named .gitignore at the top level of your repository, and just add a single line saying “*.pwc”)