Changing the Hostname - Redhat Linux 6

This video Tutorial explains how you go about changing the hostname of a Redhat Linux Server and keep it persistent across reboots

[sakeththodupunuri]

Bro can you tell me how to change $ to # mode

[maharajnarayanan]

Hello there, Im running redhat server and currently installed no-ip client so that i could expos my pc to internet, and im running a tomcat server and hosting a webpage, firstly i was running ubuntu and windows with no-ip it was no issue, when i type the noip id followed with the dir like sample.hopto.org:8080/mypage it loads the page, but in linux it says 404 not found, do u have any possible solution to it. Thanks in Advance