#!/bin/sh
case $1 in
  https://rumble.com/c/*)
    ;;
  *)
    printf "'%s' doesn't look like a Rumble channel URL\n"
    exit 1
    ;;
esac
curl -s $1 | sed -En '/title__link/s/.*href=\"(.*)\">/https:\/\/rumble.com\1/p'