Short for `curl` content-length. I use this all the time, sometimes on my /assets/application.css to measure code bloat, if any.

gistfile1.sh

curl-cl () {
  local cl=$(curl -sI $1 | grep "Content-Length" | cut -d " " -f2)
  echo $cl | ruby -r 'action_pack' -e 'require "action_view" ; include ActionView::Helpers::NumberHelper ; puts number_to_human_size(STDIN.read.strip, precision:2, separator:",")'
}

$ curl-cl http://myapp.dev/assets/applicatoin.css
782 Bytes