Invariably, you may find yourself with a missing YUM install or a corrupted installation and need to re-install yum to fix this problem.

Yum of course is used to easily install RPM packages like PHP or Apache or pretty much anything.  It’s equivalent would be “apt-get” on Debian based Linux systems.

So here’s how you would install YUM from scratch:
rpm -Uvh http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/libxml2-2.6.16-10.i386.rpm
rpm -Uvh http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/libxml2-python-2.6.16-10.i386.rpm
rpm -Uvh http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/python-elementtree-1.2.6-5.el4.centos.i386.rpm
rpm -Uvh http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/sqlite-3.3.6-2.i386.rpm
rpm -Uvh http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/python-sqlite-1.1.7-1.2.1.i386.rpm
rpm -Uvh http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/rpm-python-4.3.3-22_nonptl.i386.rpm
rpm -Uvh http://mirror.centos.org/centos/4/os/i386/CentOS/RPMS/python-urlgrabber-2.9.8-2.noarch.rpm
rpm -Uvh ftp://ftp.pbone.net/mirror/ftp.centos.org/4.6/os/i386/CentOS/RPMS/yum-metadata-parser-1.0-8.el4.centos.i386.rpm
rpm -Uvh ftp://ftp.pbone.net/mirror/ftp.centos.org/4.6/os/x86_64/CentOS/RPMS/yum-2.4.3-4.el4.centos.noarch.rpm

Just copy and paste the above RPM code into your SSH session.