#!/bin/bash

url="MY-OWNCLOUD-CALENDAR-DOWNLOAD-URL"
dest="MY-WEB-ACCESSIBLE-DOWNLOAD-FOLDER/calendar.ics"
user=MY-USERNAME
pwd="MY-PASSWORD"

wget \
   --quiet --output-document="$dest" \
   --auth-no-challenge \
   --http-user=$user --http-password="$pwd" \
   "$url"