# File lib/specinfra/command/arch/base/package.rb, line 3
    def check_is_installed(package,version=nil)
      if version
        grep = version.include?('-') ? "^#{escape(version)}$" : "^#{escape(version)}-"
        "pacman -Q #{escape(package)} | awk '{print $2}' | grep '#{grep}'"
      else
        "pacman -Q #{escape(package)} || pacman -Qg #{escape(package)}"
      end
    end