constant variable

How to make a variable constant in ruby so that the value remains
fixed throughout and cannot be altered at any cost

please checkout this http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Variables_and_Constants#Constants

First off, repeated posting doesn't get you answers any faster - it
just demonstrates full-on n00bishness.

To answer your actual question, there isn't any way to make a value
that is truly un-alterable. See this post for more info:

http://blog.jayfields.com/2006/12/ruby-constant-values.html

If you're depending on a programming language to defend you against
programmers, you need to fire the programmers...

--Matt Jones