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Full Discussion: Sftp large number of files
Top Forums Shell Programming and Scripting Sftp large number of files Post 302798961 by Corona688 on Thursday 25th of April 2013 12:37:43 PM
Old 04-25-2013
rsync, or 'remote sync', is an extremely common utility for duplicating entire trees of files. It is intelligent enough to avoid recopying up-to-date files while still copying ones that are out-of-date, corrupted, or missing. I've seen it used for managing hundreds of thousands of files in a go.

At its most basic, you give it a source directory and a destination directory, and it updates the contents of the destination to match the source. It has many options to control how it works. The manual page is a long read but useful.

Code:
$ mkdir a b
$ touch a/1 a/2 a/3 a/4
$ rsync a/ b  # Note a/, not a
$ ls b

1 2 3 4

$ rm a/1        # a now only contains 2 3 4
$ rsync -r a/ b # without --delete, does not delete extra files in b
$ ls b

1 2 3 4

$ rsync -r --delete a/ b # This will delete the extra file in b
$ ls b

2 3 4

$

If you run an rsync daemon on the destination, you can use rsync in a manner similar to scp: rsync /path/to/source/ user@host:/path/to/dest ...with the difference that rsync can be told to be recursive with -r, and is smarter than a blind copy.
Last edited by Corona688; 04-25-2013 at 01:46 PM..
 

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LEARN ABOUT LINUX

sftp-server

SFTP-SERVER(8)						    BSD System Manager's Manual 					    SFTP-SERVER(8)

NAME

     sftp-server -- SFTP server subsystem

SYNOPSIS

     sftp-server [-ehR] [-f log_facility] [-l log_level] [-u umask]

DESCRIPTION

     sftp-server is a program that speaks the server side of SFTP protocol to stdout and expects client requests from stdin.  sftp-server is not
     intended to be called directly, but from sshd(8) using the Subsystem option.

     Command-line flags to sftp-server should be specified in the Subsystem declaration.  See sshd_config(5) for more information.

     Valid options are:

     -e      Causes sftp-server to print logging information to stderr instead of syslog for debugging.

     -f log_facility
	     Specifies the facility code that is used when logging messages from sftp-server.  The possible values are: DAEMON, USER, AUTH,
	     LOCAL0, LOCAL1, LOCAL2, LOCAL3, LOCAL4, LOCAL5, LOCAL6, LOCAL7.  The default is AUTH.

     -h      Displays sftp-server usage information.

     -l log_level
	     Specifies which messages will be logged by sftp-server.  The possible values are: QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1,
	     DEBUG2, and DEBUG3.  INFO and VERBOSE log transactions that sftp-server performs on behalf of the client.	DEBUG and DEBUG1 are
	     equivalent.  DEBUG2 and DEBUG3 each specify higher levels of debugging output.  The default is ERROR.

     -R      Places this instance of sftp-server into a read-only mode.  Attempts to open files for writing, as well as other operations that
	     change the state of the filesystem, will be denied.

     -u umask
	     Sets an explicit umask(2) to be applied to newly-created files and directories, instead of the user's default mask.

     For logging to work, sftp-server must be able to access /dev/log.	Use of sftp-server in a chroot configuration therefore requires that
     syslogd(8) establish a logging socket inside the chroot directory.

SEE ALSO

     sftp(1), ssh(1), sshd_config(5), sshd(8)

     T. Ylonen and S. Lehtinen, SSH File Transfer Protocol, draft-ietf-secsh-filexfer-00.txt, January 2001, work in progress material.

HISTORY

     sftp-server first appeared in OpenBSD 2.8.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								  January 9, 2010							       BSD
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