RightScript to install LAMP/drush/Drush make

gistfile1.txt

#!/bin/bash -ex 

logger -t RightScale "\n\nStarting Script..."
/usr/bin/apt-get update

logger -t RightScale "\n\nApt-Get Update..."
/usr/bin/apt-get -y -q upgrade

logger -t RightScale "\n\nAutoremove/Autoclean..."
/usr/bin/apt-get autoremove
/usr/bin/apt-get autoclean

logger -t RightScale "\n\nInstalling Apache..."
/usr/bin/apt-get -y -q install chkconfig imagemagick  apache2 apache2-mpm-prefork 
/sbin/chkconfig --add 35 apache2

logger -t RightScale "\n\nInstalling MySQL..."
/usr/bin/apt-get -y -q install  mysql-client-5.1 mysql-server-5.1  
/sbin/chkconfig --add 35 mysql

logger -t RightScale "\n\nInstalling PHP..."
/usr/bin/apt-get -y -q install php5 php5-cli php5-mysql libapache2-mod-php5 php5-mcrypt php5-curl php5-gd php-pear
/usr/sbin/service apache2 restart
/usr/bin/pear upgrade

logger -t RightScale "\n\nInstalling Drush..."
/usr/bin/pear channel-discover pear.drush.org
/usr/bin/pear install drush/drush

logger -t RightScale "\n\nInstalling Jenkins..."
/usr/bin/wget -q -O - http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key | sudo apt-key add -
/bin/sh -c 'echo deb http://pkg.jenkins-ci.org/debian binary/ > /etc/apt/sources.list.d/jenkins.list'
/usr/bin/apt-get update
/usr/bin/apt-get -y install jenkins > $LOGFILE 2>&1 &

logger -t RightScale "\n\Adding Jenkins Proxy..."
/usr/sbin/a2enmod proxy
/usr/sbin/a2enmod proxy_http
/usr/sbin/a2enmod vhost_alias
/bin/sed -i 's/--webroot/--prefix=\/build\ --webroot/g' /etc/default/jenkins

logger -t RightScale "\n\Forcing Jenkins Reload..."
/usr/sbin/service jenkins force-reload
_old="<\/VirtualHost>"
_new="\n\<Proxy \*\>\nOrder deny,allow\nAllow from all\n<\/Proxy>\nProxyPreserveHost on\nProxyPass \/build http:\/\/localhost:8080\/build\n\<\/VirtualHost\>\n"
/bin/sed -i "s/$_old/$_new/g" /etc/apache2/sites-available/default
/usr/sbin/service apache2 restart
chown -R jenkins.adm /var/www

logger -t RightScale "\n\Adding Jenkins jobs..."
su jenkins
/usr/bin/git config --global user.email "$ADMIN_EMAIL_ADDRESS"
/usr/bin/git config --global user.name "Jenkins auto-build bot"
/bin/mkdir ~/.drush
cd ~/.drush
/usr/bin/git clone --branch 6.x-2.x http://git.drupal.org/project/drush_make.git

cd ~/jobs
git clone http://github.com/stovak/dpk_jenkins
cp -R dpk_jenkins/* .
rm -Rf dpk_jenkins
exit

logger -t RightScale "\n\Forcing Jenkins Reload..."
/usr/sbin/service jenkins force-reload
rm /var/www/index.html
cat "<?php phpinfo();" > /var/www/index.php

It's not replacing old for new

that "su jenkins" doesn't actually work for you, does it?