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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