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

NAME

     tftp -- trivial file transfer program

SYNOPSIS

     tftp [-e] [host] [port]

DESCRIPTION

     The tftp utility 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.

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 connec-
	      tions 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 com-
	      mands.

     get filename
     get remotename localname
     get file1 file2 ... fileN
	      Get one or more files from the remote host.  When using the host argument, the host will be used as default host for future trans-
	      fers.  If localname is specified, the file is stored locally as localname, otherwise the original filename is used.  Note that it is
	      not possible to download two files at a time, only one, three, or more than three files, at a time.

	      To specify an IPv6 numeric address for a host, wrap it using square brackets like ``[3ffe:2900:e00c:ffee::1234]:file'' to disam-
	      biguate the colons used in the IPv6 address from the colon separating the host and the filename.

     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 destination 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 specified becomes the default for future transfers.  When remotename is
	      specified, the file is stored remotely as remotename, otherwise the original filename is used.  If the remote-directory argument is
	      used, the remote host is assumed to be a UNIX machine.  To specify an IPv6 numeric address for a host, see the example under the get
	      command.

     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.

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 restric-
     tions in place.  The exact methods are specific to each site and therefore difficult to document here.

     Files larger than 33488896 octets (65535 blocks) cannot be transferred without client and server supporting blocksize negotiation (RFC1783).

BSD
								   June 11, 2003							       BSD