notice that every page has also in the top left corner something like: on Oct 31, 2017 at 13:03 CET ( [id://1202418]=note: print w/replies, xml ) where the node ID is stored in convenient form working for any URL you use to reach the site.

In my Bibiotheca I have a listitemizator to save pm links inside list item tags. You can strip tags or modify it suiting your needs:

perl -MLWP::UserAgent -e "print qq([id://$ARGV[0]|).LWP::UserAgent->ne
+w->get('http://perlmonks.org/index.pl?node_id='.$ARGV[0])->title,']'"
+ 11164264

[id://11164264|How to get the link to a question node?]
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L*