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YUM Package Installation Updating and Removal Forensics

In previous posts I examined the internals of RPM packages and the RPM database itself. In this post, I explore how to trace RPM package installation, update and removal on Linux distributions which use YUM (YellowDog Update Modified). If you examine /var/log/yum.log, an example of which is shown below, you will note that the date component of each entry includes the day and month but not the year. Feb 15 10:00:44 Updated: ibus-1.5.5-1.fc20.x86_64 Feb 15 10:00:45 Updated: ibus-gtk2-1.5.5-1.fc20.x86_64 Feb 15 10:00:47 Updated: python-boto-2.23.0-1.fc20.noarch Feb 15 10:00:48 Installed: python-dropbox-1.6-4.fc20.noarch Feb 15 10:00:56 Installed: python-crypto-2.6.1-1.fc20.x86_64 Feb 15 10:00:57 Installed: python-paramiko-1.10.1-2.fc20.noarch Feb 15