How to enter the C shell (csh

How to enter the C shell (csh

This is a part of the Houdini for Linux's Installation README file.
3.Before Starting Houdini, you must first set up the shell environment.
At a C shell prompt (csh or tcsh), type the following:
source houdini_setup
This command initializes the current shell's environment to run
Houdini.
I think the README file's meaning is leave the default shell,
bash, and enter the C shell (csh or tcsh).
How to enter the C shell (csh or tcsh)?
Thank you.
直接输入csh or tcsh就可以了!不过看你有没有装过csh or tcsh好像redhat默认不安装的!
非常感谢.
copy cshrc file from /etc to your home directory and rename it  to be .cshrc

Change the shell to csh.
%>chsh
input your password.

It will take effect at the next time you start the terminal.  Csh will become the default shell then.

Everytime you change the .cshrc configuration, use
%> source .cshrc
to active the change you made.