1 Add option -f for rm.py.
4 Add option -s for cmp.py.
7 Extend remove-old-files.py: add option -v/--verbose to report every removed file.
10 Rename remove-old-files.py to find.py. Make options more GNU find-like.
13 Extend find.py: add options to find files by name, extension, path.
16 After dropping Python 2.7: use shutil.which().