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9 tftp: TFTP client

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 may be specified on the command line, in which case tftp uses host as the default host for future transfers.

     tftp [option]... host

9.1 Commands

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

? command-name
Print help information.
ascii
Shorthand for mode ascii
binary
Shorthand for mode binary
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 file-name
get remotename localname
get file...
Get a file, or a set of files, from the specified sources. The source can be in one of two forms: a file name on the remote host, if the host has already been specified, or a string of the form ‘host:filename’ to specify both a host and file name at the same time. If the latter form is used, the last hostname specified becomes the default for future transfers. When specifying a numeric IPv6 address as host part, then this address must be enclosed between square brackets, since it contains colons and would interfere with the delimiter before the file name. Brackets are optional for IPv4 addresses.
          tftp> get [2001:1234::12]:issue

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 file... 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 ‘host: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. The same use of square brackets for enclosing numeric IPv6 addresses applies here, as was mentioned for the command get.
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.
trace
Toggle packet tracing.
verbose
Toggle verbose mode.

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.