# File lib/chef/provider/group/dscl.rb, line 49
        def get_free_gid(search_limit=1000)
          gid = nil; next_gid_guess = 200
          groups_gids = safe_dscl("list /Groups gid")
          while(next_gid_guess < search_limit + 200)
            if groups_gids =~ Regexp.new("#{Regexp.escape(next_gid_guess.to_s)}\n")
              next_gid_guess += 1
            else
              gid = next_gid_guess
              break
            end
          end
          return gid || raise("gid not found. Exhausted. Searched #{search_limit} times")
        end