~ $ id
uid=1000(prauscher) gid=1000(prauscher) groups=1000(prauscher),7(lp),10(wheel),90(network),92(audio),108(vboxusers),150(wireshark)
~ $ sudo id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),19(log)
~ $ sudo -u #-1 id
uid=0(root) gid=1000(prauscher) groups=1000(prauscher)