Bash: Monitor file addition/deletion in a directory

Silly little script to monitor changes in a directory (new or removed files)

Takes the destination dir to monitor from stdin

One day I'll learn how to use inotify.

#!/bin/bash

# Monitor a directory for file changes
# (add or remove) as requested

touch /tmp/testdirb.$$
while true
do
find $1 -print > /tmp/testdira.$$
diff /tmp/testdira.$$ /tmp/testdirb.$$ > /tmp/dirdiff
if [ -s /tmp/dirdiff ]
then
sed -i s/" sed -i s/">"/"Removed files"/ /tmp/dirdiff
/usr/bin/mail -s "Files changed in $1" "you@example.com" There have been file changes in $1 since the last hour.
`cat /tmp/dirdiff`
EOF
fi

cp /tmp/testdira.$$ /tmp/testdirb.$$
sleep 3600
done