http://www.oracle-base.com/articles/12c/oracle-db-12cr1-installation-on-oracle-linux-6.php
http://www.oracle-base.com/articles/linux/automating-database-startup-and-shutdown-on-linux.php
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http://tutorialforlinux.com/2013/10/06/red-hat-rhel-6-64bit-how-to-prepare-for-12c-database-installation-with-oracle-pre-installed-rpm/
http://tutorialforlinux.com/2013/10/06/how-to-install-oracle-12c-database-on-centos-6-linux-64bit-step-by-step-easy-guide/