O: messages

Ϊk: messages [user message]

:

  UF[Ѽƪ message O, NܧA{ҦOHATC
pGnǻTOH, ҦpڷQ kenming n۩I, iOLbW,
undTL:

   messages kenming , n[!
  
  pU kenming W messages OKiݨکүdTCҦ
messages OdϥΪ̲M (erase) ̬C

O: erase tell
