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** lftp-2.0 This package `lftp' contains the following components: lftp cool command line ftp client. lftpget shell script for downloading by URL, calls `lftp -c'. ftpget a simple non-interactive tool for downloading files (deprecated) These programs are written in C++ and are cooperative-threaded. lftp ~~~~ lftp is quite a powerful ftp client. It uses GNU readline to read commands. It uses shell-like command syntax allowing you to launch several commands in parallel in background (&). Some commands allow redirecting its output (cat, ls) to file or via pipe to external command. Commands can be started conditionally based on termination status of previous command (&&, ||). Also, it is 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 and back with command `wait' (or `fg' which is alias to `wait'). When you think you are done but some jobs are not yet finished, you can just exit and lftp will move itself to nohup mode in background. The same happens when you have a real hangup. lftp has reliable put, reput, mirror, and many other commands. Use command `help' or read documentation to learn more. Every operation in lftp is reliable, that is any not fatal error is ignored and the operation is repeated. 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. 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 0' 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), here are some: * cmd:csh-history - (bool) enables csh-like history expansion * cmd:long-running - (seconds) time of command execution, which is considered as `long' and a beep is done before next prompt. 0 means off. * cmd:ls-default - (string) default ls argument * cmd:prompt - (string) prompt. lftp recognizes some bash escapes, such as \u, \h, \w. * cmd:remote-completion - (bool) whether to use remote completion. * net:idle - (seconds) close idle connections locally after this time * net:max-retries - (num) limit maximum number of operation retries (default 0=unlimited) * ftp:passive-mode - (bool) passive mode ftp * ftp:proxy - (string) ftp proxy * net:reconnect-interval - (seconds) minimal time between reconnects. * net:relookup-always - (bool) relookup host address each time before connecting * ftp:sync-mode - (bool) send one command at a time and wait for response. Might be necessary to set it to `on' if buggy ftp server or router is used. Setting it to `off' speeds up command/response exchange with server, especially if ping time is significant. * net:timeout - (seconds) network protocol timeout Variable names can be abbreviated and prefix can be omitted unless the rest becomes ambiguous. See man page for other variables. You can also use `set -a' to see all current valiables and their values, and `set -d' to see variable defaults. Where to get ~~~~~~~~~~~~ By FTP: ftp://ftp.yars.free.net/pub/software/unix/net/ftp/client/lftp/ ftp://metalab.unc.edu/pub/Linux/system/network/file-transfer/ By HTTP: http://ftp.yars.free.net/pub/software/unix/net/ftp/client/lftp/ http://metalab.unc.edu/pub/Linux/system/network/file-transfer/ By CVS: CVSROOT=:pserver:email@example.com:/home/lav/cvsroot 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 `http://ftp.yars.free.net/projects/lftp/'. Internals ~~~~~~~~~ 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 ftpget. 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. Systems ~~~~~~~ The package is known to compile on Solaris2.5(gcc), Linux, FreeBSD, SCO v5.0(gcc), IRIX(gcc). 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 firstname.lastname@example.org with `subscribe lftp' in body of message; to send letters to the list, send them to email@example.com; to unsubscribe, send mail to firstname.lastname@example.org with `unsubscribe lftp' in body of message. This is low volume list. There is also list email@example.com for snapshot announcements and other development. Author ~~~~~~ Author: Alexander V. Lukyanov <firstname.lastname@example.org> Postal address: Aviatorov st. 80-45, Yaroslavl 150051, Russia Comments and bug reports are welcome.