tftp - trivial file transfer program
tftp [ host [port]]
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 as the default host, and if specified,
port as the default port, for future transfers. See the con-
nect command below.
Once tftp is running, it issues the prompt tftp> and recog-
nizes the following commands:
connect host-name [ port ]
Set the host, and optionally port, for transfers. The
TFTP protocol, unlike the FTP protocol, does not main-
tain 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
Set the mode for transfers; transfer-mode may be one
of ascii or binary. The default is ascii.
put localfile remotefile
put filename1 filename2 ... filenameN remote-directory
Transfer a file, or a 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
to specify both a host and filename at the same time. If the
latter form is used, the specified host becomes the default
for future transfers. If the remote-directory form is used,
the remote host is assumed to be running the UNIX system.
The host can be a host name (see hosts(4) or ipnodes(4)) or
an IPv4 or IPv6 address string (see inet(7P) or inet6(7P)).
Since IPv6 addresses already contain ":"s, the host should
be enclosed in square brackets when an IPv6 address is used.
Otherwise, the first occurrence of a colon will be inter-
preted as the separator between the host and the filename.
Files may be written only if they already exist and are
publicly writable. See in.tftpd(1M).
get remotename localname
get filename1 filename2 filename3 ... filenameN
Get a file or set of files (three or more) from the
specified remote 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:
to specify both a host and filename at the same time.
If the latter form is used, the last host specified
becomes the default for future transfers. See the put
command regarding specifying a host.
quit Exit tftp. An EOF also exits.
Toggle verbose mode.
trace Toggle packet tracing.
Show current status.
Set the per-packet retransmission timeout, in seconds.
Set the total transmission timeout, in seconds.
ascii Shorthand for mode ascii.
Shorthand for mode binary.
The value of the transfer blocksize option to nego-
tiate with the server. A value of 0 disables the nego-
tiation of this option.
The value of the retransmission timeout option to
request that the server uses. A value of 0 disables
the negotiation of this option.
tsize A toggle that sends the transfer size option to the
server. By default, the option is not sent. The
transfer size option is not sent with a write request
when the transfer-mode is ascii.
? [ command-name ... ]
Print help information.
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWtftp |
in.tftpd(1M), hosts(4), ipnodes(4),attributes(5),inet(7P),
Malkin, G. and Harkin, A. RFC 2347, TFTP Option Extension.
The Internet Society. May 1998
Malkin, G. and Harkin, A. RFC 2348, TFTP Blocksize Option.
The Internet Society. May 1998
Malkin, G. and Harkin, A. RFC 2349, TFTP Timeout Interval
and Transfer Size Options. The Internet Society. May 1998
Sollins, K.R. RFC 1350, The TFTP Protocol (Revision 2).
Network Working Group. July 1992.
The default transfer-mode is ascii. This differs from pre-
SunOS 4.0 and pre-4.3BSD systems, so explicit action must be
taken when transferring non-ASCII binary files such as exe-
Because there is no user-login or validation within the TFTP
protocol, many remote sites restrict file access in various
ways. Approved methods for file access are specific to each
site, and therefore cannot be documented here.
When using the get command to transfer multiple files from a
remote host, three or more files must be specified. If two
files are specified, the second file is used as a local
Man(1) output converted with