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36 .Nd trivial file transfer program
43 utility is the user interface to the Internet
45 (Trivial File Transfer Protocol),
46 which allows users to transfer files to and from a remote machine.
49 may be specified on the command line, in which case
53 as the default host for future transfers (see the
59 is running, it issues the prompt
61 and recognizes the following commands:
63 .Bl -tag -width verbose -compact
64 .It Cm \&? Ar command-name ...
65 Print help information.
68 Shorthand for "mode ascii"
71 Shorthand for "mode binary"
73 .It Cm connect Ar host-name Op Ar port
84 does not maintain connections between transfers; thus, the
86 command does not actually create a connection,
87 but merely remembers what host is to be used for transfers.
88 You do not have to use the
90 command; the remote host can be specified as part of the
96 .It Cm get Ar filename
97 .It Cm get Ar remotename localname
98 .It Cm get Ar file1 file2 ... fileN
99 Get a file or set of files from the specified
102 can be in one of two forms:
103 a filename on the remote host, if the host has already been specified,
104 or a string of the form
106 to specify both a host and filename at the same time.
107 If the latter form is used,
108 the last hostname specified becomes the default for future transfers.
110 .It Cm mode Ar transfer-mode
111 Set the mode for transfers;
121 .It Cm put Ar localfile remotefile
122 .It Cm put Ar file1 file2 ... fileN remote-directory
123 Put a file or set of files to the specified
124 remote file or directory.
126 can be in one of two forms:
127 a filename on the remote host, if the host has already been specified,
128 or a string of the form
130 to specify both a host and filename at the same time.
131 If the latter form is used,
132 the hostname specified becomes the default for future transfers.
133 If the remote-directory form is used, the remote host is
137 If you need to specify IPv6 numeric address to
139 wrap them using square bracket like
141 to disambiguate the colon.
146 An end of file also exits.
148 .It Cm rexmt Ar retransmission-timeout
149 Set the per-packet retransmission timeout, in seconds.
154 .It Cm timeout Ar total-transmission-timeout
155 Set the total transmission timeout, in seconds.
158 Toggle packet tracing.
169 Because there is no user-login or validation within
172 protocol, the remote site will probably have some
173 sort of file-access restrictions in place. The
174 exact methods are specific to each site and therefore
175 difficult to document here.
177 Files larger than 33488896 octets (65535 blocks) cannot be transferred
178 without client and server supporting blocksize negotiation (RFC 1783).