Formally speaking, this is transitive relation:
Introducer status is transferable; that is, an introducers’ introducer will become your introducer as well. (syncthing manual)
And again, I've been attacked by heavy Unix psychosis.
Getting all mp3 files from In Our Time podcast
curl http://podcasts.files.bbci.co.uk/b006qykl.rss | xmlstarlet format --indent-tab | grep -oE '(http|https)://(.*).mp3' | sort | uniq | wget -nc -i -
xmlstarlet to tidy XML output (must be installed).
grep -o to extract only URL with mp3 extension
wget -nc -i - to download URLs from stdin, but skip existing files (XML output may contain duplicates)
In the same manner, get ~5 recent BBC news podcasts (only head -20 added and RSS URL changed):
curl https://podcasts.files.bbci.co.uk/p02nq0gn.rss | xmlstarlet format --indent-tab | grep -oE '(http|https)://(.*).mp3' | head -20 | wget -nc -i -
head -20, again, because of MP3 URL duplicates.
Getting Luke’s ENGLISH Podcast, but only for the year 2024.
wget -m https://teacherluke.co.uk/ cd teacherluke.co.uk/2024 grep -R https | grep mp3 | grep -oE '(http|https)://(.*).mp3' | grep -v paypal | grep "^https://open.acast.com" > URLs
URLs file needs a bit cleaning, and then:
wget -i URLs