Defaults parameter, parameter_list # Affect all users on any host. Defaults@Host_List parameter, parameter_list # Affects all users on a specific host. Defaults:User_List parameter, parameter_list # Affects a specific user. Defaults!Cmnd_List parameter, parameter_list # Affects a specific command. Defaults>Runas_List parameter, parameter_list # Affects commands being run as a specific user.