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NetBSD 6.1.5 - man page for tftp (netbsd section 1)

TFTP(1) 			   BSD General Commands Manual				  TFTP(1)

NAME
     tftp -- trivial file transfer program

SYNOPSIS
     tftp [-e] [host] [port]

DESCRIPTION
     tftp is the user interface to the Internet TFTP (Trivial File Transfer Protocol), which
     allows users to transfer files to and from a remote machine.  The remote host (and optional
     port) may be specified on the command line, in which case tftp uses host (and port) as the
     default for future transfers (see the connect command below).

     The optional -e argument sets a binary transfer mode as well as setting the extended options
     as if tout, tsize, and blksize 65464, had been given.

     The Multicast TFTP option is supported in open-loop (i.e., "slave-only") mode based on IETF
     draft-dion-tftp-multicast-option-01.txt (May 2002), which in turn was based on RFC2026.

COMMANDS
     Once tftp is running, it issues the prompt 'tftp>' and recognizes the following commands:

     ? command-name ...
	      Print help information.

     ascii    Shorthand for "mode ascii"

     binary   Shorthand for "mode binary"

     blksize blk-size
	      Set the tftp blksize option to blk-size octets (8-bit bytes).  Since the number of
	      blocks in a tftp get or put is 65535, the default block size of 512 bytes only
	      allows a maximum of just under 32 megabytes to be transferred.  The value given for
	      blk-size must be between 8 and 65464, inclusive.	Note that many servers will not
	      respect this option.

     connect host-name [port]
	      Set the host (and optionally port) for transfers.  Note that the TFTP protocol,
	      unlike the FTP protocol, does not maintain connections between transfers; thus, the
	      connect command does not actually create a connection, but merely remembers what
	      host is to be used for transfers.  You do not have to use the connect command; the
	      remote host can be specified as part of the get or put commands.

     get filename
     get remotename localname
     get file1 file2 ... fileN
	      Get a file or set of files from the specified sources.  Source can be in one of two
	      forms: a filename on the remote host, if the host has already been specified, or a
	      string of the form hosts:filename to specify both a host and filename at the same
	      time.  If the latter form is used, the last hostname specified becomes the default
	      for future transfers.

     mode transfer-mode
	      Set the mode for transfers; transfer-mode may be one of ascii or binary.	The
	      default is ascii.

     put file
     put localfile remotefile
     put file1 file2 ... fileN remote-directory
	      Put a file or set of files to the specified remote file or directory.  The destina-
	      tion can be in one of two forms: a filename on the remote host, if the host has
	      already been specified, or a string of the form hosts:filename to specify both a
	      host and filename at the same time.  If the latter form is used, the hostname spec-
	      ified becomes the default for future transfers.  If the remote-directory form is
	      used, the remote host is assumed to be a UNIX machine.  If you need to specify IPv6
	      numeric address to hosts, wrap them using square bracket like [hosts]:filename to
	      disambiguate the colon.

     quit     Exit tftp.  An end of file also exits.

     rexmt retransmission-timeout
	      Set the per-packet retransmission timeout, in seconds.

     status   Show current status.

     timeout total-transmission-timeout
	      Set the total transmission timeout, in seconds.

     tout     Toggle the tftp "timeout" option.  If enabled, the client will pass its
	      retransmission-timeout to the server.  Note that many servers will not respect this
	      option.

     trace    Toggle packet tracing.

     tsize    Toggle the tftp "tsize" option.  If enabled, the client will pass and request the
	      filesize of a file at the beginning of a file transfer.  Note that many servers
	      will not respect this option.

     verbose  Toggle verbose mode.

HISTORY
     The tftp command appeared in 4.3BSD.  IPv6 support was implemented by WIDE/KAME project in
     1999.  TFTP options were implemented by Wasabi Systems, Inc., in 2003, and first appeared in
     NetBSD 2.0.  Multicast TFTP was implemented by Jared D. McNeill in 2006, and first appeared
     in NetBSD 4.0.

SECURITY CONSIDERATIONS
     Because there is no user-login or validation within the TFTP protocol, the remote site will
     probably have some sort of file-access restrictions in place.  The exact methods are spe-
     cific to each site and therefore difficult to document here.

BSD					  July 23, 2006 				      BSD


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