bash-2.03$ 
bash-2.03$ whoami
roger
bash-2.03$ 
bash-2.03$ 
bash-2.03$ id
uid=10000(roger) gid=2000(developer)
bash-2.03$ 
bash-2.03$ id roger
uid=10000(roger) gid=2000(developer)
bash-2.03$ 
bash-2.03$ id vange
uid=10001(vange) gid=2000(developer)
bash-2.03$ 
bash-2.03$ id -a      
uid=10000(roger) gid=2000(developer) groups=2001(autosys),2002(cvs),2003(uat),2000(developer)