# File lib/chef/provider/user/dscl.rb, line 51
        def get_free_uid(search_limit=1000)
          uid = nil; next_uid_guess = 200
          users_uids = safe_dscl("list /Users uid")
          while(next_uid_guess < search_limit + 200)
            if users_uids =~ Regexp.new("#{Regexp.escape(next_uid_guess.to_s)}\n")
              next_uid_guess += 1
            else
              uid = next_uid_guess
              break
            end
          end
          return uid || raise("uid not found. Exhausted. Searched #{search_limit} times")
        end