Cron script I leave running on my home computer in case my ISP decides to change my IP

save-ip-to-dropbox

#!/bin/bash

BIN_CURL=$(which curl)
FILE_IP=/Users/steve/Dropbox/ip-home
URL_DETECT=icanhazip.com

echo "Config values:
  curl bin:      $BIN_CURL
  ip file:       $FILE_IP
  detection url: $URL_DETECT
"

IP_OLD=$(cat "$FILE_IP")

echo "Current IP:  $IP_OLD"

IP_NEW=$($BIN_CURL -sS "$URL_DETECT" 2>/dev/null)

echo "Detected IP: $IP_NEW"

if [ ! -z "$IP_NEW" ] && [ "$IP_NEW" != "$IP_OLD" ]; then
  echo "Updating..."
  echo "$IP_NEW" > "$FILE_IP"
else
  echo "Detected IP was empty or unchanged"
fi

echo "Done"