Answer Posted / shanu

 gpasswd
Usage: gpasswd [-r|-R] group
       gpasswd [-a user] group
       gpasswd [-d user] group
       gpasswd [-A user,...] [-M user,...] group
#gpasswd -a user1 dba
Adding user user1 to group dba
#gpasswd -M user2,user3 dba //multiple users

or

#usermod -g primary_grp username
#usermod -g dba user1

#usermod -G sec_grp username
#usermod -G oper,oinstall oracle

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