To find all the git repositories in a directory, you can run the following command (which search for the .git directories):

find . -type d -name .git

It is using the find command, with the type directory, and name .git.

If you want to delete them, you can do this:

find . -type d -name .git | xargs rm -rf

PS: The find command has a -delete option, but that somehow doesn’t work with directory.

Remove all .DS_Store and .gitignore

If you are like me who wants to clean up a directory with all the git stuff and send to a possibly Windows user, you could run these:

find . -name '*.DS_Store' -type f -delete
find . -name '.gitignore' -type f -delete

The -delete option works for the files.