Shell Programming and Scripting

#!/bin/sh
target=www.google.com
date +"%D"_"%T" >> /home/rich/mtr.log
echo "----------------------------------------" >> /home/rich/mtr.log
mtr -report -c 5 $target >> /home/rich/mtr.log
mtrlog=`cat /home/rich/mtr.log | awk '/%/ { print $2 }'`
zeroloss=0%
if [ "$mtrlog" = "$zeroloss" ] ; then
        echo "No packetloss"
fi

mtrlog 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%

zeroloss 0%

#!/usr/bin/env sh
target=www.google.com
log=/home/rich/mtr.log
date +"%D"_"%T" >>$log

mtr -report -c 5 $target | awk -v logf=$log '
   { print >>logf; }          # save all mtr output to log file for history
   index( $2, "%" ) > 0  {  # you could do /%/ but that might catch more than youd like  /packet loss/ would be best if that is in the output
        if( max < $2+0 )     # allow for multiple in output; keep largest
             max = $2+0;     # +0 forces it to be numeric
   }
   END { 
      if( max == 0 )          # write to tty the findings of this pass
           printf( "no packet loss\n" );
      else
           printf( "packet loss of %d%%\n", max );
   }'