Drupal multi-site cron with basic auth option. Targets a sites directory to get a list of available sites to process. Add sites to exclude to the egrep list.

multisite-cron.php

#!/bin/bash

# This script will iterate through the sites directory of a multi-site install
# and run the cron.php for each named site in the directory.

# NOTE: the domain defined in 'sites/default' must be run separately or via a symlink.
DEFAULTDOMAIN=www.example.com

# Set the system path for the multi-site "sites" directory
SITESROOT=/path/to/drupal/sites

# Handle the default site
wget -O - -q http://$DEFAULTDOMAIN/cron.php

# Switch to your sites directory
cd $SITESROOT
# Exclude options her such as dev sites.
for site in $(ls |egrep -v "all|default|.svn|example.dev")
do
  # Basic cron
  wget -O - -q  http://$site/cron.php
  # With basic auth options
  #wget --user={username} --password={my password} -O - -q  http://$site/cron.php
done