ok
[root@www1 ~]# grep shared /etc/group
shared:x:500:acceuil,admin,adrien,agathe,agenda,alice,anna,annesophie,audio10,audio11,cecile,charles,christophe,clemence,compta,compta2,elisa,fichecom,flore,forum,francebb,francois,gabriel,hugo,infos,isaline,laura,lauriane,ludo,mahel,marlene,mosaic1,mosaic2,nabi,nicob,nodalaudio,nodalvideo,pascal,poubelle,prod1,prod2,ps,public,qc.michele,raphael,reception,reception-a,record,regie,robin,rousseaux,satanas,sf,shelly,thierry,christophetest,aude,testmail,gaspard_g,olivier,florian,prescilla,remi