How to Search for Files Recursively into Subdirectories

You can do it with find only:

find . -name '*.xml'

. is the current directory. If you need to search in another directory, replace . with the directory path.

Try using Find

sudo find . -print | grep -i '.*[.]xml'

Try this command:

ls -R | grep '.*[.]xml'

ls doesn't have options to filter the output. For that you would need to use pipe. This passes the output from ls to grep, which then filters them to show just the .xml files.