How to prevent pacman (archlinux's package manager) from reinstalling packages that were already installed?

 pacman -S packagename    # install and reinstall if exists

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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