FreeBSD - How to change screen to use BASH

Purpose :
Make screen, the virtual terminal program, changes the user's default shell from tcsh to BASH when starting.

Command :

Start multiple command line screen session to run interactive jobs

As an BSD & Linux administrator, the command line is where we live. We eat, live & shit at the same place, command line screen. Some times, we can only afford to open a single terminal screen. It's kind of hard for us to be efficient as most of the time we multitask on a few bunch of screens.

Or, we need to run an interactive program over a long period of time which we want the result when it ends. Instead passing the program to run in the background which hides the result, the screen command is at disposal.

And most importantly, when combine with ssh (secure shell) it is uncomparablely fast and secure.

Screen is capable to detach from command line session and yet the program runs interactively in the background. The ability to switch from multiple screen will definitely help out when using the console session. Screen can even start in a few "screen session" in order to manage your task into separate groups. Screen also supports hot key (the meta control key with the combination of alphabet or digit) for common task.

Part I will guide any first time screen user on how to start a multiple screen command line to run multiple screen session. Proceed to Part II for a more advanced experience.