Online tool for crawling a website and retriving all meta information for every page

Does anyone know of a free online tool that can crawl any given website and return just the Meta Keywords and Meta Description information?

From stackoverflow

• I think you have to code by yourself :(

  But no panic, it's not hard, I think you can do it with a couple of unix commands :)

• Assuming you have access to Linux/Unix:

  mkdir temp
  cd temp
  wget -r SITE_ADDRESS
  

  Then, for keywords:

  egrep -r -h 'meta[^>]+name="keywords' * | sed 's/^.*content="\([^"]*\)".*$/\1/g'
  

  and for descriptions:

  egrep -r -h 'meta[^>]+name="description' * | sed 's/^.*content="\([^"]*\)".*$/\1/g'
  

  If you want all the unique keywords, try:

  egrep -r -h 'meta[^>]+name="keywords' * | sed 's/^.*content="\([^"]*\)".*$/\1/g' | sed 's/\s*,\s*/\n/g' | sort | uniq
  

  I'm sure there's a one-liner or program out there that does this exact thing, and there are definitely easier answers.