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
Once tftp is running, it issues the prompt and recognizes
the following commands:
- Print help information.
- Shorthand for
- Shorthand for
- 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 remotename localname
- 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
- Set the mode for transfers; transfer-mode may be one of
‘ascii’ or ‘binary’. The default is ‘ascii’.
put localfile remotefile
- 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.
- Exit tftp. An end of file also exits.
- Set the per-packet retransmission timeout, in seconds.
- Show current status.
- Set the total transmission timeout, in seconds.
- Toggle packet tracing.
- 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.