Bash script to watch a process and notify you with a text when it is no longer running

watchdog.sh

#!/bin/bash
#
# Watchdog watches a process passed in as the first argument waits until 
# it finishes and then sends a text message to the number provided.
#

PID=$1
NUMBER=$2
MESSAGE=$3

while kill -0 $PID 2> /dev/null; do
	sleep 10
done

curl http://textbelt.com/text -d number=$NUMBER -d message="$MESSAGE"

Example usage: ./watchdog.sh 4725 5555555555 "Process done."