Shell Programming and Scripting

while read line
do
   #   one ping to the current hostname
   ping -c 1 ${line} > /dev/null 2>&1
   #   get the exit code of ping command
   RETVAL=$?
   if [ ${RETVAL} -ne 0 ] ; then
      #   log error somewhere, send a mail to someone, etc.
   fi
done < /path/to/config_file

for host in $(cat network_hosts);do 
   if [ ! "$( ping -c 1 $host 2>/dev/null| grep '1 received' )" ] ; then 
      echo "$host is unresponsive"
   fi
done

root@[/] #cat network_hosts
frssit02.standardchartered.co.in
frssit01.standardchartered.co.in
cbspssit.standardchartered.co.in
cbspsuat.standardchartered.co.in
cbsappfs1.standardchartered.co.in
cbsappfs2.standardchartered.co.in
cbdodbfs2.standardchartered.co.in