One of our client has Redhat 5.6 and he is asking to update only the important packages.
But question is how do we know which are the important packages.
Note:: It will be a partial Update not complete update.
Take a look at the yum-security package which is the "Yum plugin to enable security filters". From the package info:
This plugin adds the options --security, --cve, --bz and --advisory flags to yum and the list-security and info-security commands. The options make it possible to limit list/upgrade of packages to specific security relevant ones. The commands give you the security information.