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Practical UNIX and Internet Security, 3rd Edition by Alan Schwartz, Gene Spafford, Simson Garfinkel

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Updating System Software

Several factors go into the selection of a particular Unix operating system or application and the choice of which version of the software to run, but we won’t try to get into those issues here.[262] Once you’ve settled on which version of which software you’re going to install, however, it is imperative that you ensure that patches are available for all known security problems in the software, that you find those patches, and that you apply them. Similarly, once the system is up and running, you must be vigilant in learning about newly discovered security problems in your operating system and applications so you’ll be able to apply patches for them as they become available.

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