Do simple test for connecting to remote service

test-network.sh

#!/bin/sh

logfile=/tmp/test-network.log

d=`date`
echo -n $d >> $logfile

# Check SSH connection to somewhere external
for host in ts-b.ucl.ac.uk ts-c.ucl.ac.uk
do
  if nc -zw1 $host 22; then
    echo -n "  $host okay" >> $logfile
  else
    echo -n "  $host n/a " >> $logfile
  fi
done

echo >> $logfile