How to omit JavaScript and comments using nutch crawl?

I am a newbie at this, trying to use Nutch 1.2 to fetch a site. I'm using only a Linux console to work with Nut开发者_如何学Goch as I don't need anything else. My command looks like this

bin/nutch crawl urls -dir crawled -depth 3

bin/nutch readseg -dump crawled/segments/20110401113805 /home/nutch/dumpfiles

Any help appreciated!

beware there are two different filter files, one for the one stop crawl command and the other for the step-by-step commands. For the rest just build a regex that will match the urls you want to skip, add minus before and you shoulb de done.