Работает под debian.

# mkdir -p /opt/scripts/monitoring/active_alerts

Скрипт ложить в /opt/scripts/monitoring/checker.sh

[code=bash] #!/bin/bash

SCRIPT_DIR=/opt/scripts/monitoring LOG_FILE=${SCRIPT_DIR}/status.log PHONES="80501234567 80507654321" CURDATE=`/bin/date +"%s"`;

function alert {

  for i in $PHONES;
  do  
      echo "$1 $2 $3" | /usr/sbin/sendmail -fmonitoring@monitoring ${i}@sms.mysmsgate.com;
  done

}

function check {

  cat $SCRIPT_DIR/targets |  while read ip server;
  do  
      /usr/bin/wget -T 5 --tries=3 -q -O - http://${ip}/.do_not_remove.php | grep SUCCESS >/dev/null;
      if [[ $? == 0 ]]; then
          if [[ -e $SCRIPT_DIR/active_alerts/$server ]]; then
              cat $SCRIPT_DIR/active_alerts/$server | while read startdate;
              do  
                  DATE=`/bin/date +"%F %T"`;
                  let "i =  $CURDATE - $startdate";
                  lenght=`/bin/date -u +"%T" --date=@${i}`;
                  alert "$DATE" $server "is UP, downtime is $lenght";
                  echo "$DATE" $server "is UP, downtime is $lenght" > $LOG_FILE
                  rm -f $SCRIPT_DIR/active_alerts/$server
              done
          fi
      else
          if [[ -e $SCRIPT_DIR/active_alerts/$server ]]; then
              MINUTE=`/bin/date +"%M"`
              if [[ $MINUTE == 00 ]]; then
                  cat $SCRIPT_DIR/active_alerts/$server | while read startdate;
              do  
                  DATE=`/bin/date +"%F %T"`;
                  let "i =  $CURDATE - $startdate";
                  lenght=`/bin/date -u +"%T" --date=@${i}`;
                  alert "$DATE" $server "down for $lenght";
              done
              fi
          else
              echo $CURDATE > $SCRIPT_DIR/active_alerts/$server;
              DATE=`/bin/date +"%F %T"`;
              alert "$DATE" $server "is DOWN";
              echo "$DATE" $server "is UP, downtime is $lenght" > $LOG_FILE
          
          fi
      fi
  done

}

check [/code]