Installing updates from the Linux Shell is very simple in CentOS 4 and RHEL4 (with a valid subscription). Below are two of the most commonly used methods.
The first method can be dangerous, is easier because it is a non-interactive installation. It automatically assumes yes to all prompts.
yum -y update
The second method is safer and is exactly the same as the first method, except it will prompt you at specified parts of the installation process.
yum update
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