watch-url

#!/bin/bash
# Takes recipient as first and URL to watch as second argument.
# Will create a file in the folderto compare the last state
# with the current one.

RECIPIENT=$1
URL=$2
FILENAME=$(echo "$URL" | sed -e 's,/,*,g')

if [ ! -e "$FILENAME" ]; then
    curl "$URL" > "$FILENAME"
fi

curl "$URL" > "$FILENAME.new"

DIFF=$(diff -u "$FILENAME" "$FILENAME.new")

[ $? -ne 0 ] && echo sent && \
sendmail -t <<EOF
To: $RECIPIENT
From: url-watcher
Subject: $URL has changed.

"$DIFF"
EOF

mv "$FILENAME.new" "$FILENAME"