Monitor files in a directory, do stuff when contents change.

dir_mon

#!/bin/sh

# Via http://www.unix.com/shell-programming-scripting/100979-folder-watch.html

DIR=foo
STATIC=contents
ls -al $DIR > contents.tmp

diff -q contents.tmp $STATIC  
if [ ! $? -eq 0 ]
then
	cp contents.tmp $STATIC
	echo "Directory Changed" | mail -s "Directory Changed $DIR" youremail@yourhost.com
fi

exit 0