Execute the following commands as root:

# groupadd oinstall
# groupadd dba
# groupadd oper
# groupadd apache
# useradd -g oinstall -G dba oracle
# passwd oracle

Set the password for user oracle.

The final destination of the software will be here:

# mkdir /u01 /u02
# chown oracle.dba /u01 /u02
# chmod 755 /u01 /u02