Bash Script used to update multiple NRPE Agents on multiple hosts from a text file.

NRPE Multi-Agent Updater Script

#!/bin/bash
#
# NRPE Multi-Agent Updater Script
#
# Author   :   Ryan Irujo
# Inception:   03.07.2012
#
# Description: Bash Script used to update multiple NRPE Agent on multiple hosts listed in a text file
#              called 'hosts.txt'.
#
# Notes:       DO NOT RUN THIS SCRIPT AS ROOT! Run this script ONLY using a Service or User Account
#
# How To Use:  You will be prompted twice for the password for each host you are updating. Keeping
#              the User or Service Account Password available for Copy/Paste is handy here.
#
#              To add/remove hosts you want to update, edit the 'hosts.txt' file in the
#              /home/howler/export/ directory accordingly.


if [ "$1" = "" ]; then
    echo "Please provide the [Release] you want to install, i.e. - 1.2, 1.4, etc..."
    exit 2;
#elif [ $VARIABLE -eq $VARIABLE 2> /dev/null ]; then
elif [ $1 = $1 ]; then
    echo "*****************************************"
    echo "`cat hosts.txt`";
    echo "mon-nrpe-plugin-2.12-$1.x86_64.rpm will be installed on the server(s) in \"hosts.txt\":ok?[yes/no]";
    read response
    if [ $response == "no" ]; then
    echo "Exiting Script...";
    exit 2;
    elif [ $response == "yes" ]; then
    for host in `cat hosts.txt`;
        do
        scp /home/howler/export/mon-nrpe-plugin-2.12-$1.x86_64.rpm howler@$host:/home/howler ;
        ssh -t $host " rpm -qa mon-nrpe-plugin
                       sudo /bin/rpm -e mon-nrpe-plugin
                       sudo /bin/rpm -i mon-nrpe-plugin-2.12-$1.x86_64.rpm
                       /usr/lib64/nagios/plugins/check_nrpe -H localhost
                       rm -rf mon-nrpe-plugin-2.12-* && echo 'RPMs have been cleaned out of the home directory.'" ;
        done
    fi
fi