Download Ruby source code
$ wget ftp://ftp.ruby-lang.org//pub/ruby/ruby-1.9-stable.tar.gz
$ tar zxvf ruby-1.9-stable.tar.gz
To configure Ruby, if you are not superuser
$ ./configure --prefix=$HOME/bin
By default it installs in /usr/local/bin
$ ln -s bin/irb irb
To access irb from any location.
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