To upgrade
Change # to approprite number.

cd /var/www/html/[moodlesitedirectory]

php admin/cli/maintenance.php --enable
git branch -a
To find out what branch site is currently tracking

git branch --track MOODLE_2#_STABLE origin/MOODLE_2#_STABLE;
git checkout MOODLE_2#_STABLE;
php admin/cli/upgrade.php --non-interactive;
php admin/cli/maintenance.php --disable;
php admin/cli/cron.php
chown apache:apache * -R

To backup a site
[] you change

Create /home/backup directory.

tar -cvf /home/backup/moodlecode.tar /var/www/html/[moodledirectory]
tar -cvf /home/backup/moodledata.tar /var/www/[moodledatadirectory]
mysql -u root p[yourpassword] [moodledbname] > /home/backup/[moodlename].sql


To install
CentOS/RHEL - as root user.  Apache document root is /var/www/html/
Apache root is /var/www/

Change ## to version number of Moodle

Create the database:

mysql -u root -p[yourpassword]
mysql> create database moodle## character set utf8 collate utf8_general_ci
mysql> \q

mkdir /var/www/moodle##data
chown apache:apache /var/www/moodle##data
cd /var/www/html/
git clone git://git.moodle.org/moodle.git moodle##
cd moodle##
git branch -a
git branch --track MOODLE_##_STABLE origin/MOODLE_##_STABLE;
git checkout MOODLE_##_STABLE;
php admin/cli/install.php;
chown apache:apache * -R

The install process will prompt for site information.