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#!/bin/bash
mkdir -p ~/.w3watch/cache || exit 1
if [ ! -f ~/.w3watch/urls ]; then
echo "~/.w3watch/urls not found!"
exit 1
fi
if [ -f ~/.w3watch/lock ]; then
echo "w3watch already running"
exit 1
fi
touch ~/.w3watch/lock || exit 1
for i in $(cat ~/.w3watch/urls); do
dump=$(lynx -dump "$i")
if [ $? -ne 0 ]; then
rm -f ~/.w3watch/lock
exit 1
fi
sum=$(echo "$i" | sha1sum | awk '{print $1;}')
cachefile=~/.w3watch/cache/${sum}
if [ -f "$cachefile" ]; then
echo "$dump" | diff -u --label "$i" "$cachefile" -
fi
echo "$dump" > "$cachefile"
done
# remove old cache entries
for i in ~/.w3watch/cache/*; do
sumi=$(basename "$i")
for j in $(cat ~/.w3watch/urls); do
sumj=$(echo "$j" | sha1sum | awk '{print $1;}')
if [ "$sumi" == "$sumj" ]; then
continue 2
fi
done
rm -f $i
done
rm -f touch ~/.w3watch/lock
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