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This is the BSDA Study Guide Book written via a wiki collaboration. This is a work in progress. You may contribute to or discuss this specific page at http://bsdwiki.reedmedia.net/wiki/Determine_which_software_requires_upgrading.html.
Determine which software requires upgrading
Recognize the importance of balancing the need to keep software up-to-date while minimizing the impact on a production system. Dragonfly and NetBSD use pkgsrc which provides utilities for determining which installed software is out-of-date. FreeBSD provides pkg_version and third-party utilities are also available which integrate with the BSD package managers.
pkgsrc/pkgtool/pkg_chk and make show-downlevel for Dragonfly and NetBSD; pkg_version(1), and the third-party portupgrade