kill_job

# File lib/shell/process-controller.rb, line 199
    def kill_job(sig, command)
      @jobs_sync.synchronize(:EX) do
        if @waiting_jobs.delete command
          ProcessController.inactivate(self)
          return
        elsif @active_jobs.include?(command)
          begin
            r = command.kill(sig)
            ProcessController.inactivate(self)
          rescue
            print "Shell: Warn: $!\n" if @shell.verbose?
            return nil
          end
          @active_jobs.delete command
          r
        end
      end
    end