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#!/bin/sh
get_feed()
{
link="$(curl -L -s "$1" | pup 'link[title=RSS] attr{href}' 2>/dev/null)"
[ "$link" ] && printf "%s\n" "$link" | tee /dev/stderr && exit
}
[ "$1" ] || exit 1
# url is channel
get_feed "$1"
part="$(echo "$1" | awk -F '/' '{print $NF}')"
# last part is channel id
get_feed "https://www.youtube.com/channel/$part"
# last part is channel tag
get_feed "https://www.youtube.com/$part"
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