Add user groups, configure permissions, and configure a user password

groupadd oinstall

groupadd asmadmin

groupadd asmdba

groupadd asmoper

groupadd dba

groupadd oper

useradd -g oinstall -G asmadmin,asmdba,asmoper,oper,dba grid

useradd -g oinstall -G asmdba,oper,dba oracle

As a best practice, configure the Oracle and Grid passwords to be the same.