pacman example

       pacman -Ss ne.hack
           Search for regexp "ne.hack" in package database.

       pacman -S gpm
           Download and install gpm including dependencies.

       pacman -U /home/user/ceofhack-0.6-1-x86_64.pkg.tar.gz
           Install ceofhack-0.6-1 package from a local file.

       pacman -Syu
           Update package list and upgrade all packages afterwards.

       pacman -Syu gpm
           Update package list, upgrade all packages, and then install gpm if
           it wasn't already installed.