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32 .\" @(#)tftp.1 8.2 (Berkeley) 4/18/94
33 .\" $FreeBSD: src/usr.bin/tftp/tftp.1,v 1.4.2.7 2002/06/21 15:29:33 charnier Exp $
34 .\" $DragonFly: src/usr.bin/tftp/tftp.1,v 1.5 2007/11/23 23:16:37 swildner Exp $
35 .\"
36 .Dd April 18, 1994
37 .Dt TFTP 1
38 .Os
39 .Sh NAME
40 .Nm tftp
41 .Nd trivial file transfer program
42 .Sh SYNOPSIS
43 .Nm
44 .Op Ar host
45 .Sh DESCRIPTION
46 The
47 .Nm
48 utility is the user interface to the Internet
49 .Tn TFTP
50 (Trivial File Transfer Protocol),
51 which allows users to transfer files to and from a remote machine.
52 The remote
53 .Ar host
54 may be specified on the command line, in which case
55 .Nm
56 uses
57 .Ar host
58 as the default host for future transfers (see the
59 .Cm connect
60 command below).
61 .Sh COMMANDS
62 Once
63 .Nm
64 is running, it issues the prompt
65 .Dq Li tftp>
66 and recognizes the following commands:
67 .Pp
68 .Bl -tag -width verbose -compact
69 .It Cm \&? Ar command-name ...
70 Print help information.
71 .Pp
72 .It Cm ascii
73 Shorthand for "mode ascii"
74 .Pp
75 .It Cm binary
76 Shorthand for "mode binary"
77 .Pp
78 .It Cm connect Ar host-name Op Ar port
79 Set the
80 .Ar host
81 (and optionally
82 .Ar port )
83 for transfers.
84 Note that the
85 .Tn TFTP
86 protocol, unlike the
87 .Tn FTP
88 protocol,
89 does not maintain connections between transfers; thus, the
90 .Cm connect
91 command does not actually create a connection,
92 but merely remembers what host is to be used for transfers.
93 You do not have to use the
94 .Cm connect
95 command; the remote host can be specified as part of the
96 .Cm get
97 or
98 .Cm put
99 commands.
100 .Pp
101 .It Cm get Ar filename
102 .It Cm get Ar remotename localname
103 .It Cm get Ar file1 file2 ... fileN
104 Get a file or set of files from the specified
105 .Ar sources .
106 .Ar Source
107 can be in one of two forms:
108 a filename on the remote host, if the host has already been specified,
109 or a string of the form
110 .Ar hosts:filename
111 to specify both a host and filename at the same time.
112 If the latter form is used,
113 the last hostname specified becomes the default for future transfers.
114 .Pp
115 .It Cm mode Ar transfer-mode
116 Set the mode for transfers;
117 .Ar transfer-mode
118 may be one of
119 .Em ascii
120 or
121 .Em binary .
122 The default is
123 .Em ascii .
124 .Pp
125 .It Cm put Ar file
126 .It Cm put Ar localfile remotefile
127 .It Cm put Ar file1 file2 ... fileN remote-directory
128 Put a file or set of files to the specified
129 remote file or directory.
130 The destination
131 can be in one of two forms:
132 a filename on the remote host, if the host has already been specified,
133 or a string of the form
134 .Ar hosts:filename
135 to specify both a host and filename at the same time.
136 If the latter form is used,
137 the hostname specified becomes the default for future transfers.
138 If the remote-directory form is used, the remote host is
139 assumed to be a
140 .Ux
141 machine.
142 If you need to specify IPv6 numeric address to
143 .Ar hosts ,
144 wrap them using square bracket like
145 .Ar [hosts]:filename
146 to disambiguate the colon.
147 .Pp
148 .It Cm quit
149 Exit
150 .Nm .
151 An end of file also exits.
152 .Pp
153 .It Cm rexmt Ar retransmission-timeout
154 Set the per-packet retransmission timeout, in seconds.
155 .Pp
156 .It Cm status
157 Show current status.
158 .Pp
159 .It Cm timeout Ar total-transmission-timeout
160 Set the total transmission timeout, in seconds.
161 .Pp
162 .It Cm trace
163 Toggle packet tracing.
164 .Pp
165 .It Cm verbose
166 Toggle verbose mode.
167 .El
168 .Sh HISTORY
169 The
170 .Nm
171 command appeared in
172 .Bx 4.3 .
173 .Sh BUGS
174 Because there is no user-login or validation within
175 the
176 .Tn TFTP
177 protocol, the remote site will probably have some
178 sort of file-access restrictions in place. The
179 exact methods are specific to each site and therefore
180 difficult to document here.
181 .Pp
182 Files larger than 33488896 octets (65535 blocks) cannot be transferred
183 without client and server supporting blocksize negotiation (RFC 1783).