assuming your webserver user is www-data and desired password 123456 cd path/to/web2py
sudo -u www-data python -c "from gluon.main import save_password;
save_password('123456',443)"
--
assuming your webserver user is www-data and desired password 123456 cd path/to/web2py
sudo -u www-data python -c "from gluon.main import save_password;
save_password('123456',443)"
--