FTPD(8)                                       BSD System Manager's 

     ftpd [-AdDhlMnPSU] [-T maxtimeout] [-t timeout] [-u mask] 
-A      anonymous only or accounts listed in /etc/ftpchroot. Other connection attempts are refused.  
      not effective if PAM is enabled.
-d      Debugging to syslog 
-D      detach and become a daemon, forking child processes to handle ftp connections. 
	lower overhead than starting from inetd(8), useful on busy servers to reduce load.  
-h      use data ports in the high port range for passive connections.  
	the IPPORT_HIFIRSTAUTO and IPPORT_HILASTAUTO defines in <netinet/in.h>.  
	In OpenBSD they are set to 49152 and 65535 respectively.  
-l      log sessions using syslog. Specify twice to log detail
-M      multihomed mode.  Instead of simply using ~ftp for anonymous transfers,
	a directory matching the fully qualified name of the IP number the client connected to, and located inside ~ftp is used instead.  
-n      numeric IP addresses in logs 
-P      Permit illegal port numbers or addresses for PORT command initiated connects.  
-S      logs anonymous transfers to /var/log/ftpd 
-T      timeout period request from client permittd; the maximum period allowed may be set to timeout seconds with the -T option.  The default limit is 2 hours. 
-t      timeout inactivity  seconds
-u  ogw     umask default from 027 to iogw.

/etc/nologin disables ftp access.  ftpd displays it and exits.  
/etc/ftpwelcome printed  before issuing the readyi message.
/etc/motd is displayed afterlogin 
 .message in a directory, is displayed it when that directory is entered. 

Commands accepted from the contro port
Request    Description
CDUP       change Directory UP to parent
CWD        change working directory

LIST       list files in a directory (ls -lgA)
MDTM       show last MoDification TiMe of file

NLST       name list of files in directory
PASV       prepare for server -to -server transfer (passive)
RETR       retrieve a file 
STOR       store a file
STOU       store a file with a unique name
APPE       append to a file
DELE       delete a file
REST       restart incomplete transfer

PWD        print working directory
MKD        make a directory
RMD        remove a directory

RNFR       specify rename -from file name
RNTO       specify rename -to file name
SIZE       size of file
STAT       status of server
STRU       specify data transfer structure
SYST       show operating system type of server system
ALLO       allocate storage (vacuously)
NOOP       do nothing
QUIT       terminate session
ABOR       abort 
SITE       non-standard commands (see next section)

SITE commands 
Request    Description
UMASK      change umask, e.g. ``SITE UMASK 002''
IDLE       set idle -timer, e.g. ``SITE IDLE 60''i
CHMOD      change mode of a file, e.g. ``SITE CHMOD 755 filename''

globbing as used by csh.  This allows users to utilize the metacharacters ``*?[]{}~''.
1.   username must be in /etc/passwd, and not have a null password.  If the user has an S/Key key, the response from a successful USER command will include an S/Key challenge.  The client may choose to respond with a PASS command giving either a standard password or an S/Key one -time password. The server will automatically determine which type of password it has been given and attempt to authenticate accordingly. See skey(1) for more information on S/Key authentication.  S/Key is a Trademark of Bellcore.  
2.   username must not appear /etc/ftpusers.  
3.   The user must have a standard shell returned by getusershell(3).  
4.   If the user username appears in the file /etc/ftpchroot the session's root will be changed to the user's login directory by chroot(2) as for an ``anonymous'' or ``ftp'' account (see next item).  However, the user must still supply a password.  This feature is intended as a compromise between a fully anonymous account and a fully privileged account.  The account should also be set up as for an anonymous account.
5.   anonymous or ftp account must be present in the password file (user ``ftp'').  In this case the user is allowed to log in by specifying any password (by convention an email address for the user should be used as the password).  
special measures to restrict the client's access privileges.  
The server performs a chroot(2) to the home directory of the ftp user.
	the ftp subtree be constructed with care, 
	~ftp      home directory owned by root and mode 555
.  	~ftp/bin  owned by root and mode 511.
		required, and should contain at least a statically linked copy of ls(1.) 
		Programs in this directory should be mode 111 (executable only).
	~ftp/etc  Make this directory owned by ``root'' and mode 511).  
		The files passwd(5) and group(5) must be present for the ls command to be able to produce owner names rather than numbers.  The password field in passwd is not used, and should not contain real passwords.  
	motd, printed after a successful login.  These files should be mode 444.  
	~ftp/lib  owned by root and mode 511.
	The libraries ld -linux.so.2 and libc.so.6 (or whatever your ls command is linked to) must be present.  In order to read passwd(5) and group(5), the library libnss_files.so.2 is also needed.  Note that if you're using a 2.2.* or later Linux kernel, ld -linux.so.2 must be executable as well as readable (555).  
	All other files should be mode 444.  
	~ftp/pub  owned by ``root mode 555 .  This is traditionally where publically accessible files are stored for download.

/etc/ftpusers    unwelcome/restricted users.
/etc/ftpchroot   users who should be chroot'd.  
/etc/ftpwelcome  Welcome notice.
/etc/motd        Welcome notice after login.
/etc/nologin     Displayed and access refused.
/var/run/utmp    List of users on the system.
/var/log/ftpd    Log file for anonymous transfers.

SEE ALSO ftp(1), skey(1), who(1), getusershell(3), ftpusers(5), syslogd(8) 

BUGS The server must run as the super -user to create sockets with privileged port numbers.  It maintains an effective user ID of the logged in user, reverting to the super -user only when binding addresses to sockets. 

Apple seems to have decided that it is not desirable to provide an easy method to start the ftp daemon, i.e. it is no longer in the system preferences sharing configuration.

to start the ftp daemon use: sudo -s launchctl load -w /System/Library/LaunchDaemons/ftp.plist following is from support.apple.com/kb/HT4704
to start the ftp daemon use: sudo -s launchctl load -w /System/Library/LaunchDaemons/ftp.plist sudo dseditgroup -o create -n /Local/Default -u dger com.apple.access_ftp sudo dseditgroup -o edit -u dge-a dgerman com.apple.access_ftp sudo launchctl load -w /System/Library/LaunchDaemons/ftp.plist


VSftpD VerySecure ftp Daemon