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I need to see currently installed updates and security patches on Linux Gentoo. How I can do this?

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The Gentoo Linux Security Team releases Security Advisories (GLSAs) which can be checked with glsa-check if your system is affected by the given security advisories. You just have to sync your portage tree (emerge --sync) and then run glsa-check -l and it will tell you which known security holes you have and how to solve them.

glsa-check is part of the gentoolkit.

And very important is Maintenance. This article shows how to keep your system up to date and clean.

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