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	message											CDUP
		description															change to parent of current working directory
		section										req supported					The supported request by the FTP daemon
			message									ABOR					abort previous command
			message									ACCT					specify account (ignored)
			message									ADAT					send an authentication protocol message
			message									ALLO					allocate storage (vacuously)
			message									APPE					append to a file
			message									AUTH					specify an authentication protocol to be performed
			message									CCC					set the command channel protection mode to 'Clear' (no protection). Only available if the -c command-line option was given.
			message									CDUP					change to parent of current working directory
			message									CWD					change working directory
			message									DELE					delete a file
			message									ENC					send a privacy and integrity protected command (given in argument)
			message									HELP					give help information
			message									LIST					give list files in a directory (''ls -lgA'')
			message									MIC					send an integrity protected command (given in argument)
			message									MKD					make a directory
			message									MDTM					show last modification time of file
			message									MODE					specify data transfer mode
			message									NLST					give name list of files in directory
			message									NOOP					do nothing
			message									PASS					specify password
			message									PASV					prepare for server-to-server transfer
			message									PBSZ					specify a protection buffer size
			message									PORT					specify data connection port
			message									PROT					specify a protection level under which to protect data transfers
			message									PWD					print the current working directory
			message									QUIT					terminate session
			message									REST					restart incomplete transfer
			message									RETR					retrieve a file
			message									RMD					remove a directory
			message									RNFR					specify rename-from file name
			message									RNTO					specify rename-to file name
			message									SITE					non-standard commands (see next section)
			message									SIZE					return size of file
			message									STAT					return status of server
			message									STOR					store a file
			message									STOU					store a file with a unique name
			message									STRU					specify data transfer structure
			message									SYST					show operating system type of server system
			message									TYPE					specify data transfer type
			message									USER					specify user name