Shell Programming and Scripting

# echo "10101" | awk '{ x=gsub("0",""); print x }'
2
# echo "10001" | awk '{ x=gsub("0",""); print x }'
3
# echo "10000" | awk '{ x=gsub("0",""); print x }'
4

host Ip status Count
hosta XXX.XXX.XXX.XXX Critical 11011
hostb XXX.XXX.XXX.XXX Critical 11110

host Ip status Count
hosta XXX.XXX.XXX.XXX Critical 11110
hostc XXX.XXX.XXX.XXX Critical 11110

host Ip status Count
hosta XXX.XXX.XXX.XXX Critical 10110
hostb XXX.XXX.XXX.XXX Critical 11101
hostc XXX.XXX.XXX.XXX Critical 11110

#!/usr/bin/ksh
 
export LOG=/tmp/ssh.other_host.$$ FAIL_CT=/tmp/ssh.other_host.$$.ct
 
echo 0 >$FAIL_CT
 
while [ $(<$FAIL_CT) != 4 ]
do
 while [ $(<$FAIL_CT) != 4 ]
 do
  last=$( date )
  echo "
$last
" &                   # background in case pipe blocks
  sleep 1
  if ( fgrep -q "$last" $LOG )
  then
   echo 0 >$FAIL_CT
   sleep 60
   continue
  fi
  echo $(( $(<$FAIL_CT) + 1 ))>$FAIL_CT
 done | ssh other_host "cat -u"
done >$LOG 2>&1
 
(
 date "+%Y-%m-%d_%H:%M:%S ${0##*/} ($$) Unreachable: other_host
============================================"
 tail -25 $LOG
 ) | mailx -s "${0##*/} Unreachable: other_host" support_id@your_email_host