gistfile1.sh

#!/usr/bin/env bash

USER=$1
PASSWD=$2

AGENT="Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.45 Safari/534.13"

function bail {
  echo $1
  exit $2
}

ticket=$(curl -s \
              --user-agent "${AGENT}" \
              --cookie-jar cjar \
              --location \
              --referer ";auto" \
              -d "user=${USER}&passwd=${PASSWD}&rm=2&deviceAuthn=false" \
              -d "forceAuthn=true&s=ccentral-cima&r=comcast.net" \
              -d "continue=https://customer.comcast.com/Secure/Home.aspx" \
              https://login.comcast.net/login | tee one.html | \
         grep cima\.ticket | \
         sed -e 's/.*cima.ticket" value="\([^"]*\).*$/\1/')

[ $? -eq 0 ] || bail "could not login and grab the ticket" $?

curl -s \
     --user-agent "${AGENT}" \
     --cookie-jar cjar \
     --cookie cjar \
     --location \
     --referer "https://customer.comcast.com/Secure/Home.aspx;auto" \
     --data-urlencode "cima.ticket=${ticket}" \
     "https://customer.comcast.com/Secure/Home.aspx" > /dev/null

[ $? -eq 0 ] || bail "could not post the ticket" $?

usage=$(curl -s \
             --user-agent "${AGENT}" \
             --cookie-jar cjar \
             --cookie cjar \
             --location \
             --referer "https://customer.comcast.com/Secure/Home.aspx;auto" \
             https://customer.comcast.com/Secure/Users.aspx | \
        grep "GB of" | sed 's/^[^>]*>\([^<]*\)<.*$/\1/')

[ $? -eq 0 ] || bail "could not find the usage" $?

echo "usage: ${usage}"