id

Usage: id [OPTION]... [NOM-D'USAGER]
Print information for USERNAME, or the current user.
 -a              ignore, for compatibility with other versions
 -Z, --context   print only the security context of the current process
 -g, --group     print only the effective group ID
 -G, --groups    print all group IDs
 -n, --name      print a name instead of a number, for -ugG
 -r, --real      print the real ID instead of the effective ID, with -ugG
 -u, --user      print only the effective user ID
     --help      afficher l'aide-mémoire
     --version   afficher le nom et la version du logiciel
Sans aucune OPTION, afficher les informations utiles d'identification.