Download already buffered youtube video ubuntu11.04

1:file /proc/*/fd/* 2>/dev/null | grep Flash | cut -f1 -d:

output:/proc/12631/fd/17

Now go to this path and that's it voila we are done :-)

2: cp $(file /proc/*/fd/* 2>/dev/null | grep Flash | cut -f1 -d: | head -n 1) VideoName.avi  

Above command will save this video in your current working directory ....