tftp -- trivial file transfer program
tftp [-e] [host] [port]
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).
-e sets a binary transfer mode as well as setting the extended options as if tout, tsize, and blksize 65464, had
tftp> ; following commands:
connect host [port]
Sets the host and port does not create a connection, since TFTP protocol does not maintain connections between transfers.|
host can be specified as part of the
binary. The default is ascii.
| Shorthand for mode ascii.
| Shorthand for mode binary.
get remotename localname
get file1 file2 … fileN
from the remote host. |
When using the host argument, the host will be used as default for future transfers.
If localname is specified, the file is stored locally as localname, otherwise the original filename is used.
It is not possible to download two files at a time(as 2 names space
localname!, only one, three, or more than three files, at a time.
To specify an IPv6 numeric address for a host, use square brackets for example:
Otherwise the colon iseperates the host and the filename.
put localfile remotefile
put file1 file2 ... fileN remote-directory
to the remote file or directory. |
The destination can be in form: 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 file- name 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.
| Set the per-packet retransmission timeout, in seconds.
| Set the total transmission timeout, in seconds.
|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.
|Toggle packet tracing.
| 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.
The value for |
blk-size must be between 8 and 65464, inclusive. Note many servers will not respect this option.
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.
? command-name ...
|output help information.
|Toggle verbose mode.
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.
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.
Files larger than 33488896 octets (65535 blocks) cannot be transferred without client and server supporting blocksize negotiation