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.
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 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. 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.
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 specific to each site and
therefore difficult to document here.
BSD June 11, 2003 BSD
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