hnt@usrpi4:~$ python3 -m virtualenv
usage: virtualenv [--version] [--with-traceback] [-v | -q] [--app-data APP_DATA] [--clear-app-data] [--discovery {builtin}] [-p py] [--creator {builtin,cpython3-posix,venv}] [--seeder {app-data,pip}] [--no-seed]
                  [--activators comma_sep_list] [--clear] [--system-site-packages] [--symlinks | --copies] [--download | --no-download] [--extra-search-dir d [d ...]] [--ipaddr version] [--contextlib2 version] [--appdirs version]
                  [--progress version] [--pkg_resources version] [--idna version] [--html5lib version] [--urllib3 version] [--wheel version] [--webencodings version] [--certifi version] [--packaging version] [--pyparsing version]
                  [--pytoml version] [--chardet version] [--distro version] [--CacheControl version] [--six version] [--msgpack version] [--distlib version] [--lockfile version] [--pip version] [--retrying version] [--colorama version]
                  [--pep517 version] [--requests version] [--setuptools version] [--no-ipaddr] [--no-contextlib2] [--no-appdirs] [--no-progress] [--no-pkg_resources] [--no-idna] [--no-html5lib] [--no-urllib3] [--no-wheel]
                  [--no-webencodings] [--no-certifi] [--no-packaging] [--no-pyparsing] [--no-pytoml] [--no-chardet] [--no-distro] [--no-CacheControl] [--no-six] [--no-msgpack] [--no-distlib] [--no-lockfile] [--no-pip] [--no-retrying]
                  [--no-colorama] [--no-pep517] [--no-requests] [--no-setuptools] [--symlink-app-data] [--prompt prompt] [-h]
                  dest
virtualenv: error: the following arguments are required: dest
hnt@usrpi4:~$