Editing Package manager (section)

===Upgrade suppression===
When a user interacts with the package management software to bring about an upgrade, it is customary to present the user with the list of actions to be executed (usually the list of packages to be upgraded, and possibly giving the old and new version numbers), and allow the user to either accept the upgrade in bulk, or select individual packages for upgrades. Many package managers can be configured to never upgrade certain packages, or to upgrade them only when critical vulnerabilities or instabilities are found in the previous version, as defined by the packager of the software. This process is sometimes called ''version pinning''.

For instance:
*[[Yellowdog Updater, Modified|yum]] supports this with the syntax ''exclude=openoffice*''<ref>{{cite web |title=CentOS yum pinning rpms|url=http://lists.centos.org/pipermail/centos/2005-May/046320.html|publisher=centos.org|access-date=2008-03-01 |url-status=unfit |archive-url= https://web.archive.org/web/20071102203232/http://lists.centos.org/pipermail/centos/2005-May/046320.html |archive-date= 2007-11-02}}</ref>
*[[Pacman (package manager)|pacman]] with ''IgnorePkg= openoffice''<ref name=pacman/> (to suppress upgrading openoffice in both cases)
*[[dpkg]] and [[dselect]] support this partially through the ''hold'' flag in package selections
*[[Advanced Packaging Tool|APT]] extends the ''hold'' flag through the complex "pinning" mechanism<ref>{{cite web|title=How to keep specific versions of packages installed (complex)|url=https://www.debian.org/doc/manuals/apt-howto/ch-apt-get.en.html#s-pin|publisher=debian.org|access-date=2008-03-01|archive-date=14 November 2019|archive-url=https://web.archive.org/web/20191114111450/https://www.debian.org/doc/manuals/apt-howto/ch-apt-get.en.html#s-pin|url-status=dead}}</ref> (Users can also blacklist a package<ref>{{cite web|title=Apt pinning to blacklist a package|url=http://linux.derkeiler.com/Mailing-Lists/Debian/2009-07/msg00476.html|access-date=2010-08-19|archive-url=https://web.archive.org/web/20110722062625/http://linux.derkeiler.com/Mailing-Lists/Debian/2009-07/msg00476.html|archive-date=22 July 2011|url-status=dead}}</ref>)
*[[Aptitude (program)|aptitude]] has "hold" and "forbid" flags
*[[Portage (software)|portage]] supports this through the package.mask configuration file
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