How can I use Ruby to colorize the text output to a terminal?

You can use 'colortheme' gem to change the color of the text in Ruby.

install with gem

gem install colortheme

install with git hub

git clone https://github.com/nimacpp/colortheme.git
cd colortheme
gem build colortheme.gemspec
gem install colortheme*.gem

how can use

first include colortheme in your code :

require 'colortheme'

then you can use it like this :

require 'colortheme'
puts "hello world".green 

output :

list of colors in colortheme :

and we have light colors in version [1.5]