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15.1 ¥æ¡¼¥¶ÄêµÁ¥³¥Þ¥ó¥É

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define adder
  print $arg0 + $arg1 + $arg2

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adder 1 2 3

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define commandname

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if

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while

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document commandname

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help user-defined

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show user
show user commandname

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