watch_web_page.sh

#!/bin/bash

URL="page to watch"
PATTERN="pattern in page to watch"

get_page() {
    curl "$URL" 2> /dev/null | grep -C 3 "$PATTERN"
}

NEW=$(get_page)
OLD=$NEW
while [ "$OLD" == "$NEW" ]; do
    OLD=$NEW
    NEW=$(get_page)
    sleep 10
done

while true; do
    spd-say "Page changed"
    sleep 5
done