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FTP>bell: ÿÍê³ÉÒ»´ÎÎļþ´«ËÍ,±¨¾¯Ìáʾ.
FTP>binary: É趨ÒÔ¶þ½øÖÆ·½Ê½´«ËÍÎļþ.
FTP>bye: ÖÕÖ¹Ö÷»úFTP½ø³Ì,²¢Í˳öFTP¹ÜÀí·½Ê½.
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FTP>cd: ͬUNIXµÄCDÃüÁî.
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