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How to make pacman (archlinux's package manager) to not reinstall when the package already installed

 pacman -S packagename    # install and reinstall if exists
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up vote 20 down vote accepted

Use the --needed option to skip reinstall of existing packages when you Sync (-S).

If a package in the list is already installed on the system, it will be reinstalled even if it is already up to date. This behavior can be overridden with the --needed option.

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I have been thinking that the pacman -Su xxx will do that But actually it still will reinstall the updated-installed xxx pacakge the --needed will do that after my testing, as for the non-updated installed package need to be tested later

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This duplicates another answer and adds no new content. Please don't post an answer unless you actually have something new to contribute. – DavidPostill Jul 4 '15 at 15:29

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