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# CWD - change working directory ¸ü¸ÄĿ¼
# DELE - delete a remote file ɾ³ýÎļþ
# LIST - list remote files ÁÐĿ¼
# MDTM - return the modification time of a file ·µ»ØÎļþµÄ¸üÐÂʱ¼ä
# MKD - make a remote directory н¨Îļþ¼Ð
# NLST - name list of remote directory
# PASS - send password
# PASV - enter passive mode
# PORT - open a data port ´ò¿ªÒ»¸ö´«Êä¶Ë¿Ú
# PWD - print working directory ÏÔʾµ±Ç°¹¤×÷Ŀ¼
# QUIT - terminate the connection Í˳ö
# RETR - retrieve a remote file ÏÂÔØÎļþ
# RMD - remove a remote directory
# RNFR - rename from
# RNTO - rename to
# SITE - site-specific commands
# SIZE - return the size of a file ·µ»ØÎļþ´óС
# STOR - store a file on the remote host ÉÏ´«Îļþ
# TYPE - set transfer type
# USER - send username
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