Am 28.03.2011 16:50, schrieb Pandu Poluan: > Hello list! > > Please bear awhile with the Gento n00b here... > > If I have a package 'xyz-1.1.0' already installed, and there's a newer > 'xyz-1.2.0', what's the difference between 'emerge --update xyz' and > 'emerge xyz'? > > The latter I saw also pulled in and installed the latest version. So, > I am confused as to the difference. > > Thank you for your explanation. > > Rgds, > >
A simple `emerge xyz` re-emerges xyz even if no update is necessary. Additionally, it adds the package xyz to your @world set. That is a list of packages that you want to keep. If xyz has been installed only because it is a dependency of another package and it is not part of @world, `emerge --depclean` would uninstall the package when it is no longer needed. As an example: Lets say, you install gnome-base/gnome. This will pull in all kinds of packages (the whole Gnome desktop environment). Now you decide to remove gnome. Then you can call `emerge --depclean gnome` to remove gnome itself and then `emerge --depclean` to get rid of everything else that is no longer needed. If you want to re-emerge a package no matter if there is an update or not but you do not want to add it to your @world set, call `emerge --oneshot xyz` or shorter: `emerge -1 xyz`. For example, this is necessary if xyz is a kernel module and you just installed ner kernel sources. A few notes: Your @world set is contained in /var/lib/portage/world. You can edit this file directly to remove or add packages. `emerge --depclean <package>` only removes the package if it is no longer needed by other packages. This is safer than calling `emerge --clean <package>`. Do not call `emerge --depclean` on its own. Call `emerge --ask --verbose --depclean` or shorter `emerge -avc`. Check all packages to make sure you do not remove anything you still need, for example portage itself. If you call `emerge --pretend --verbose --depclean <package>` (short: `emerge -pvc <package>`), portage will print a list of packages that depend on the package you gave as a parameter. This is more accurate than for example `equery depends <package>`. Hope this helps, Florian Philipp
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