Okay, so the craigslist gem that is bundled with this only works if you use ruby 1.8.7.

It also only works (due to improper dependencies) if you install nokogiri and html entities manually

 gem install bundler
 bundle
 gem install htmlentities --version=4.0
 gem install nokogiri --version=1.4.4

Copy the prowl template and add your API key

cp prowl.template.yml prowl.yml

Enter your search terms into the search_terms.yml file, one per line

Install in yer crontab:

0,5,10,15,20,25,30,35,40,45,50,55 * * * * /bin/bash -l -c 'cd ~/Sites/craigs_warn && ruby warner.rb >> /dev/null 2>&1'