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FTP program to keep remote files in synch

rsync is a replacement for rcp that has many more features. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync by sending just the differences in the files across the link, without requiring that both sets of files are present at one of the ends of the link beforehand. At first glance this may seem impossible because the calculation of diffs between two files normally requires local access to both files. A technical report describing the rsync algorithm is included with this package. Features include:

  • Ability to whole directory trees and filesystems
  • Optionally preserves symbolic links, hard links, file ownership,
  • permissions, devices and times
  • Requires no special privilages to install
  • Internal pipelining reduces latency for multiple files
  • Can use rsh, ssh or direct sockets as the transport
  • Supports anonymous rsync which is ideal for mirroring


User man pages available in HTML form from; programmer's copy of rsync.conf pages available in HTML form from


version 3.1.2 (stable)
released on 21 December 2015

VCS Checkout login password: cvs


Related Projects


LicenseVerified byVerified onNotes
License:GPLv2orlaterKelly Hopkins26 January 2009
License:GPLv3orlaterKelly Hopkins26 January 2009

Leaders and contributors

Andrew Tridgell Maintainer

Resources and communication

AudienceResource typeURI
Bug TrackingHomepage

Software prerequisites

Required to usersh/ssh (ssh recommended for security reasons)

This entry (in part or in whole) was last reviewed on 20 February 2017.


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