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Trivial file transfer program
tftp [-e] [host] [port]
Neutrino
- -e
- Use binary transfer mode and set the extended options, as if
tout, tsize, and blksize 65464 had been
given.
- host
- The host to connect to.
- port
- The port to connect to.
The tftp utility is the user interface to the
Internet TFTP (Trivial File
Transfer Protocol), which lets you
transfer files to and from a remote machine. If you specify
a remote host (and an optional port) on the command line,
tftp uses that host (and port) as the default for
future transfers (see the
connect command below).
The client host must have an entry in the
/etc/services
file to provide tftp service.
Once tftp is running, it issues a prompt and
accepts the following commands:
- ? command_name...
- Print help information.
- ascii
- Shorthand for “mode ascii” (see
mode below).
- binary
- Shorthand for “mode binary” (see
mode below).
- blksize blk-size
- Set the blocksize to blk-size octets (8-bit bytes).
Since the number of blocks in a tftp get or put
is 65535, the default block size of 512 bytes allows only a maximum of just
under 32 MB to be transferred.
The value given for blk-size must be between 8 and 65464,
inclusive.
Note that many servers don't respect this option.
- connect host [port]
- Set the host (and optionally port)
for transfers. Note that the TFTP protocol, unlike FTP,
doesn't maintain connections between transfers. That is, the
connect command doesn't actually create a
connection, but merely remembers what host to use for
transfers. You don't have to use the connect
command; you can specify the remote host as part of the
get or put commands.
- get file
get remotefile localfile
get file1 file2 ... fileN
- Get a file or set of files from the specified sources.
The 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
hosts : filename to
specify both a host and file at the same time.
If you use the latter form, the last hostname specified becomes the
default.
- mode transfer_mode
- Set the mode for transfers to either ascii or
binary (default is ascii).
- put file
put localfile remotefile
put file1 file2 ... fileN 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
hosts : filename
to specify both a host and file.
If you use the latter form,
the hostname specified becomes the default; if you use the
remote_directory form, the remote host is
assumed to be a Unix box.
If you need to specify IPv6 numeric addresses for the hosts, enclose them in
square brackets ([hosts]:filename)
to disambiguate the colon.
- quit
- Exit tftp. An end-of-file also exits.
- rexmt retransmission_timeout
- Set the per-packet retransmission timeout (specified in
seconds).
- status
- Show the current status.
- timeout total_transmission_timeout
- Set the total transmission timeout (specified in seconds).
- tout
- Toggle the timeout option.
If you use this option, the client passes its retransmission-timeout
to the server.
Note that many servers don't respect this option.
- trace
- Toggle packet tracing.
- tsize
- Toggle the tsize option.
If you enable this option, the client passes and requests the size of
a file at the beginning of a file transfer.
Note that many servers don't respect this option.
- verbose
- Toggle verbose mode.
The tftp utility requires the libsocket.so
shared library.
Since there's no user-login or validation within the TFTP
protocol, the remote site should have some file-access
restrictions — the exact methods for implementing
these vary.
/etc/services,
ftp,
tftpd
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