Find all files in the current directory and its subdirectories, print their names, and replace any phone numbers of the form XXX-XXX-XXXX with XXXXXXXXXX using sed.
find ~ -type f -print | xargs sed -i -e 's/[0-9]\{3\}-[0-9]\{3\}-[0-9]\{4\}/[0-9]\{10\}/g'