[Oracle DataBase Server 12.1 installation on Oracle Linux 6.7]: Creating folder structure for Oracle

# mkdir -p /u01/oracle/database/12.1
# chown -R oracle12:dba /u01/oracle
# chmod -R 775 /u01/oracle/database/12.1

# mkdir -p /u01/oraInventory
# chown -R oracle12:oinstall /u01/oraInventory
# chmod -R 775 /u01/oraInventory

# mkdir -p /u02/oracle/oradata/12.1
# chown -R oracle12:dba /u02/oracle/oradata/12.1
# chmod -R 775 /u02/oracle/oradata/12.1

# mkdir -p /u03/oracle/oradata/12.1/orcl12/backups
# chown -R oracle12:dba /u03/oracle/oradata/12.1/orcl12/
# chmod -R 775 /u03/oracle/oradata/12.1/orcl12/