Linux: ajudtar la hora y fecha ntpd

http://www.alcancelibre.org/staticpages/index.php/ajustes-posteriores-centos6-instalar
http://www.garron.me/en/linux/set-time-date-timezone-ntp-linux-shell-gnome-command-line.html
http://superuser.com/questions/302396/how-to-set-current-time-on-linux

Linux: Instalar Java JRE o JDK en Centos

http://www.if-not-true-then-false.com/2010/install-sun-oracle-java-jdk-jre-6-on-fedora-centos-red-hat-rhel/