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sophisticated command line file transfer program (ftp, http, sftp, fish, torrent)
C++ C Other

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** lftp-3.1.x

This package `lftp' contains the following components:

      sophisticated command line file transfer program (ftp/http client,
      also supports fish protocol and file URLs).

      shell script for downloading by URL, it calls `lftp -c'.

lftp is written in C++ and uses a cooperative-threaded model.

lftp is sophisticated file transfer program with command line interface. It
supports FTP, HTTP, FISH, SFTP and FILE (local FS) protocols. GNU Readline
library is used for input.

Low level stuff supported: ftp proxy, http proxy, ftp over http, opie/skey,
fxp transfers, automatic retrying on non-fatal errors and timeouts, ipv6,
socks, http/1.1, sftp v3-4. See FEATURES for more detailed list of

Every operation in lftp is reliable, that is any non-fatal error is ignored
and the operation is retried. So if downloading breaks, it will be
restarted from the point automatically. Even if ftp server does not support
REST command, lftp will try to retrieve the file from the very beginning
until the file is transferred completely.

lftp has shell-like command syntax allowing you to launch several commands
in parallel in background (&). It is also possible to group commands within
() and execute them in background. All background jobs are executed in the
same single process. You can bring a foreground job to background with ^Z
(c-z) and back with command `wait' (or `fg' which is alias to `wait'). To
list running jobs, use command `jobs'. Some commands allow redirecting
their output (cat, ls, ...) to file or via pipe to external command.
Commands can be executed conditionally based on termination status of
previous command (&&, ||).

If you exit lftp when some jobs are not finished yet, lftp will move itself
to nohup mode in background. The same happens when you have a real modem
hangup or when you close an xterm.

lftp has builtin mirror which can download or update a whole directory
tree. There is also reverse mirror (mirror -R) which uploads or updates a
directory tree on server.

There is command `at' to launch a job at specified time in current context,
command `queue' to queue commands for sequential execution for current
server, and much more.

On startup, lftp executes /etc/lftp.conf and then ~/.lftprc and ~/.lftp/rc.
You can place aliases and `set' commands there. Some people prefer to see
full protocol debug, use `debug' to turn the debug on. Use `debug 3' to see
only greeting messages and error messages.

lftp has a number of settable variables. You can use `set -a' to see all
variables and their values or `set -d' to see list of defaults. Variable
names can be abbreviated and prefix can be omitted unless the rest becomes

Use command `help' or read documentation (man lftp) to learn more.

If lftp was compiled with ssl support, then it includes software developed
by the OpenSSL Project for use in the OpenSSL Toolkit.

Where to get
	export CVSROOT
	cvs login (empty password, just hit enter)
	cvs -z9 co -r lftp-2-0-3 lftp (if you omit -r option, you'll get
		latest development sources)

See also home page `'.

All this is based on SMTask class which implements non-preemptive
multitasking via Do method. The method Do does a little bit of work, sets
wake up condition (block member) and returns.

The class Ftp allows reliable deliver of files via ftp protocol, it hides
all the details from application and allows asynchronous operation.
Reconnect and reget are done as necessary. It can also speed up ftp
operations by sending several commands at once and then checking all the
responses. It seems this sometimes does not work, so it is disabled by
default. To turn it on, use `set sync-mode n' in lftp or --async-mode for

Note that sending several commands is considered as violation or protocol,
but RFC959 says: ``The user-process sending another command before the
completion reply would be in violation of protocol; but server-FTP
processes should queue any commands that arrive while a preceding command
is in progress.''

It is known that some network software dealing with address translation
works incorrectly in case of several FTP commands in one network packet.

The package is known to compile on Solaris2.5(gcc), Linux, FreeBSD, NetBSD,
SCO v5.0(gcc), IRIX(gcc), Tru64(gcc) and other systems. If you can't
compile it on your system, let me know. It is possible that lftp version
2.0 can be compiled with non-gcc compilers since it does not have gcc-isms,
and it was successfully compiled by Sun C++ v5.0 compiler using
CXXFLAGS="-compat=4 -features=bool".

Mailing list
There is a mailing list for discussion of lftp and announcements. It is
managed by majordomo; to subscribe, send mail to
with `subscribe lftp' in body of message; to send letters to the list, send
them to; to unsubscribe, send mail to with `unsubscribe lftp' in body of message. This is
low volume list.

There is also list for snapshot announcements and
other development.

These lists are archived at

Author: Alexander V. Lukyanov <>
My home page:

Other people have contributed to lftp development, see THANKS and ChangeLog

Comments and bug reports are welcome. Please send them to the list:

Copyright (c) 1996-2005 by Alexander V. Lukyanov (

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

In addition, as a special exception, permission is given to link the
code of this release of lftp with the OpenSSL project's "OpenSSL"
library (or with modified versions of it that use the same license as
the "OpenSSL" library), and distribute the linked executables. You
must obey the GNU General Public License in all respects for all of
the code used other than "OpenSSL". If you modify this file, you may
extend this exception to your version of the file, but you are not
obligated to do so. If you do not wish to do so, delete this exception
statement from your version.
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