commandline session
$groups jeffrin tty dialout audio www-data mysql wireshark $groups --version | grep David Written by David MacKenzie and James Youngman. $ $groups jeffrin jeffrin : jeffrin tty dialout audio www-data wireshark mysql $groups user groups: user: no such user $groups mysql mysql : mysql $groups wireshark groups: wireshark: no such user $groups www-data www-data : www-data $groups tty groups: tty: no such user $groups dialout groups: dialout: no such user $groups audio groups: audio: no such user $