Get the current (estimation) of iTunes' 50 billion App countdown (see: http://www.apple.com/itunes/50-billion-app-countdown/)

itunes-countdown.sh

#!/bin/sh

URL="${1:-http://www.apple.com/itunes/store/counters/il6ark7ec.js}"

JSON=`curl "$URL" 2>/dev/null`

getField () {
  echo "$JSON" | sed 's/.*"'$1'" *: *\([0-9]\+\)[}, ].*/\1/p;d'
}

COUNT=`getField count`
RATE=`getField rate`
TIMESTAMP=`getField sampleTimestamp`
NOW=`date "+%s"`

expr "$COUNT" + "(" "$NOW" - "$TIMESTAMP" ")" "*" "$RATE" "/" "3600"