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

NAME

     tftp -- trivial file transfer program

SYNOPSIS

     tftp [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 may be specified on the command line, in which case tftp uses host as the default host for future
     transfers (see the connect command below).

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"

     blocksize [size]
	      Sets the TFTP blksize option in TFTP Read Request or Write Request packets to [size] as specified in RFC 2348.  Valid values are
	      between 8 and 65464.  If no blocksize is specified, then by default a blocksize of 512 bytes will be used.

     blocksize2 [size]
	      Sets the TFTP blksize2 option in TFTP Read Request or Write Request packets to [size].  Values are restricted to powers of 2 between
	      8 and 32768.  This is a non-standard TFTP option.

     connect host [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.

     debug level
	      Enable or disable debugging levels during verbose output.  The value of level can be one of packet, simple, options, or access.

     get [host:]file [localname]
     get [host1:]file1 [host2:]file2 ... [hostN:]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.

     packetdrop [arg]
	      Randomly drop arg out of 100 packets during a transfer.  This is a debugging feature.

     put file [[host:]remotename]
     put file1 file2 ... fileN [[host:]remote-directory]
	      Put a file or set of files to the remote host.  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 spec-
	      ify an IPv6 numeric address for a host, see the example under the get command.

     options [arg]
	      Enable or disable support for TFTP options.  The valid values of arg are on (enable RFC 2347 options), off (disable RFC 2347
	      options), and extra (toggle support for non-RFC defined options).

     quit     Exit tftp.  An end of file also exits.

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

     rollover [arg]
	      Specify the rollover option in TFTP Read Request or Write Request packets.  After 65535 packets have been transmitted, set the block
	      counter to arg.  Valid values of arg are 0 and 1.  This is a non-standard TFTP option.

     status   Show current status.

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

     trace    Toggle packet tracing.

     verbose  Toggle verbose mode.

SEE ALSO

     tftpd(8)

     The following RFC's are supported:

     RFC 1350: The TFTP Protocol (Revision 2).

     RFC 2347: TFTP Option Extension.

     RFC 2348: TFTP Blocksize Option.

     RFC 2349: TFTP Timeout Interval and Transfer Size Options.

     RFC 3617: Uniform Resource Identifier (URI) Scheme and Applicability Statement for the Trivial File Transfer Protocol (TFTP).

     The non-standard rollover and blksize2 TFTP options are mentioned here:

     Extending TFTP, http://www.compuphase.com/tftp.htm.

HISTORY

     The tftp command appeared in 4.3BSD.

     Edwin Groothuis <edwin@FreeBSD.org> performed a major rewrite of the tftpd(8) and tftp code to support RFC2348.

NOTES

     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 the TFTP blocksize option
     (RFC2348), or the non-standard TFTP rollover option.

BSD
								   June 22, 2011							       BSD