# File lib/specinfra/command/redhat/base/package.rb, line 3
    def check_is_installed(package, version=nil)
      cmd = "rpm -q #{escape(package)}"
      if version
        full_package = "#{package}-#{version}"
        cmd = "#{cmd} | grep -w -- #{Regexp.escape(full_package)}"
      end
      cmd
    end