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40 .Nd trivial file transfer program
47 utility is the user interface to the Internet
49 (Trivial File Transfer Protocol),
50 which allows users to transfer files to and from a remote machine.
53 may be specified on the command line, in which case
57 as the default host for future transfers (see the
63 is running, it issues the prompt
65 and recognizes the following commands:
67 .Bl -tag -width verbose -compact
68 .It Cm \&? Ar command-name ...
69 Print help information.
72 Shorthand for "mode ascii"
75 Shorthand for "mode binary"
77 .It Cm connect Ar host-name Op Ar port
88 does not maintain connections between transfers; thus, the
90 command does not actually create a connection,
91 but merely remembers what host is to be used for transfers.
92 You do not have to use the
94 command; the remote host can be specified as part of the
100 .It Cm get Ar filename
101 .It Cm get Ar remotename localname
102 .It Cm get Ar file1 file2 ... fileN
103 Get a file or set of files from the specified
106 can be in one of two forms:
107 a filename on the remote host, if the host has already been specified,
108 or a string of the form
110 to specify both a host and filename at the same time.
111 If the latter form is used,
112 the last hostname specified becomes the default for future transfers.
114 .It Cm mode Ar transfer-mode
115 Set the mode for transfers;
125 .It Cm put Ar localfile remotefile
126 .It Cm put Ar file1 file2 ... fileN remote-directory
127 Put a file or set of files to the specified
128 remote file or directory.
130 can be in one of two forms:
131 a filename on the remote host, if the host has already been specified,
132 or a string of the form
134 to specify both a host and filename at the same time.
135 If the latter form is used,
136 the hostname specified becomes the default for future transfers.
137 If the remote-directory form is used, the remote host is
141 If you need to specify IPv6 numeric address to
143 wrap them using square bracket like
145 to disambiguate the colon.
150 An end of file also exits.
152 .It Cm rexmt Ar retransmission-timeout
153 Set the per-packet retransmission timeout, in seconds.
158 .It Cm timeout Ar total-transmission-timeout
159 Set the total transmission timeout, in seconds.
162 Toggle packet tracing.
168 Because there is no user-login or validation within
171 protocol, the remote site will probably have some
172 sort of file-access restrictions in place. The
173 exact methods are specific to each site and therefore
174 difficult to document here.
176 Files larger than 33488896 octets (65535 blocks) cannot be transferred
177 without client and server supporting blocksize negotiation (RFC1783).