Shell Programming and Scripting

#!/bin/bash
# Simple SHELL script for Linux and UNIX system monitoring with
# ping command
# -------------------------------------------------------------------------
# Copyright (c) 2006 nixCraft project <http://www.cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Setup email ID below
# See URL for more info:
# http://www.cyberciti.biz/tips/simple-linux-and-unix-system-monitoring-with-ping-command-and-scripts.html
# -------------------------------------------------------------------------

# add ip / hostname separated by while space
HOSTS='cat server_list.txt'

# no ping request
COUNT=1

# email report when
SUBJECT="Ping failed"
EMAILID="test@domain.com"
for myHost in $HOSTS
do
  count=$(ping -c $COUNT $myHost | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }')
  if [ $count -eq 0 ]; then
    # 100% failed
    echo "Host : $myHost is down (ping failed) at $(date)" | mail -s "$SUBJECT" $EMAILID
  fi
done

nmap -p 15000 test1.domain.com

Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2009-06-22 16:05 EDT
Interesting ports on test.domain.com (11.11.11.11):
PORT      STATE  SERVICE
15000/tcp closed unknown

Nmap run completed -- 1 IP address (1 host up) scanned in 0.324 seconds
nmap -p 15000 test.domain.com

Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2009-06-22 16:06 EDT
Interesting ports on test.domain.com (11.11.101.11:
PORT      STATE SERVICE
15000/tcp open  unknown

Nmap run completed -- 1 IP address (1 host up) scanned in 0.310 seconds

TIMEOUT=2
URL="http://somedomain.com:80/index.html"
CHECK=$(wget --timeout=$TIMEOUT --tries=1 -qO - $URL )
if [[ ${#CHECK} > 0 ]]; then
        echo "Server up!"

else
        echo "Server Down!"
fi

tr ' ' '\n' < port_numbers.txt > port_numbersNEW.txt