# File lib/session.rb, line 446
    def clear
      stdin.puts "#{ ECHO } __clear__ 1>&2"
      stdin.puts "#{ ECHO } __clear__"
      stdin.flush
      while((line = stderr.gets) and line !~ %r/__clear__/o); end
      while((line = stdout.gets) and line !~ %r/__clear__/o); end
      self
    end