First, make sure you have Pip, Distribute and Virtualenv installed.
You can quickly set things up with:
$ curl -O http://python-distribute.org/distribute_setup.py
$ python distribute_setup.py
$ easy_install pip virtualenv
Installing the latest stable RedBarrel release is then done with:
$ pip install redbarrel
If you want to try the cutting-edge version, grab the repository and create a local virtualenv:
$ hg clone https://bitbucket.org/tarek/redbarrel
$ cd redbarrel
$ virtualenv --distribute .
$ bin/python setup.py develop
In this setup, all RedBarrel scripts will be located in the bin directory.
You can also setup bash completion:
$ sudo cp bash_completion.d/redbarrel /etc/bash_completion.d/