How to check a page for broken links

sudo apt install wget
wget --spider -r -nd -nv -l 1 <URL>

sudo apt install curl
curl -s <URL> | grep -oP 'href="\K[^"]+' | xargs -n1 curl -s -o /dev/null -w "%{http_code} %{url_effective}\n"

sudo apt install linkchecker
linkchecker --check-extern --no-status --no-warnings <URL>