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. BitTorrent protocol is supported as built-in
`torrent' command.

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-v6. See FEATURES for more detailed list of
features.

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. It is possible to attach to backgrounded
lftp instance using `attach' command in lftp.

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
ambiguous.

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.