Squid checker

#!/bin/bash
for center in pmtpa lopar knams yaseo
do
  echo "Checking $center squids:"
  for addr in `host rr.$center.wikimedia.org | cut -f 4 -d ' '`
  do
    echo -n "$addr "
    http_proxy=http://$addr:80 \
      wget --quiet -O /dev/null \
      http://en.wikipedia.org/robots.txt \
      && echo "ok" || echo "FAIL"
  done
done