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NAME

tftp — trivial file transfer program

SYNOPSIS

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

COMMANDS

Once tftp is running, it issues the prompt ‘tftp>’ and recognizes the following commands:

?|help [command ...]

Print help information.

ascii

Shorthand for mode ascii.

binary

Shorthand for mode binary.

blksize block-size

Set the block size in bytes for one packet. The default value is 512 bytes. Valid values are 8 bytes – 65464 bytes.

connect host [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 [host:]file [localname]

 

get [host1:]file1 [host2:]file2 ... [hostN:]fileN

Get a file or set of files from the remote host. When using the host argument, the host will be used as the default host for future transfers. IPv6 addresses can be specified by enclosing host in square brackets. 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 the same time; only one, three, or more than three files can be downloaded at the same time.

mode transfer-mode

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

put file [[host:]remotename]

 

put file1 file2 ... fileN [[host:]remote-directory]

Put a file or set of files to the remote host. When using the host argument, the host will be used as the default host for future transfers. IPv6 addresses can be specified by enclosing host in square brackets. If 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.

Note that files may only be written to if they already exist on the remote host and are publicly writable. See tftpd(8) for further details.

quit

Exit tftp. An end-of-file also exits.

rexmt retransmission-timeout

Set the per-packet retransmission timeout, in seconds. The default value is 5 seconds. Valid values are 1 second – 255 seconds.

status

Show current status.

timeout total-transmission-timeout

Set the total transmission timeout, in seconds. The default value is 25 seconds. Valid values are 1 second – 255 seconds.

tout

Toggle the tout option. This option delivers the retransmission timeout, which is set by rexmt, to the server, so the server uses the same retransmission timeout as the client.

tsize

Toggle the tsize option. This option delivers the total size of the file to be transferred. With this value given, the client or server can decide whether they are able to accept the file.

trace

Toggle packet tracing.

verbose

Toggle verbose mode.

SEE ALSO

ftp(1), tftp-proxy(8), tftpd(8)

HISTORY

The tftp command appeared in 4.3BSD.

BUGS

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.