command line delete all files with extension code example
Example 1: ubuntu delete all files with extension
cd <dir>
find . -type f -iname \*.jpg -delete
Example 2: remove all files with no extention rm
find . -type f ! -name "*.*" -delete
cd <dir>
find . -type f -iname \*.jpg -delete
find . -type f ! -name "*.*" -delete