[How-to]Easily save videos which have been cached

Let's say you're watching a video in Youtube and you want to save it.  You know it's been cached, but you don't know where.  How do you easily locate it?  You could go to

about:cache?device=disk

and muck around in there until you find the right one.  However, there's an easier way, involving find, file, sed, and tr.  Here's the script:

#!/bin/bash
## Set the below to your cache dir
CACHE_DIR="~/.conkeror.mozdev.org/conkeror/m8q08yyy.default/Cache/"
cd $CACHE_DIR
cp `find . | file -f - | grep "data" | grep -v "CACHE" | grep -v "gzip" | sed -e 's/\:.*data//' | sed -e 's/.*,.*//' | tr -d '\n'` ~/karaoke/Youtube/"$1".webm
cd - > /dev/null

Also, I believe this assumes you are using the html5 version of Youtube and also assumes you have cleared the cache (otherwise, multiple entries will show up).  This is a very rough script which I just hacked together to automate saving Youtube karaokes (I use conkeror, which uses the same ridiculous caching mechanism as Firefox 4+ - multiple directory levels with just a single file or two in each final folder...).

Hope this is useful for someone else!