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Concept
Rsync
Summary
rsync is a utility for efficiently and between a computer and a storage drive and across networked computers by comparing the modification times and sizes of files. It is commonly found on Unix-like operating systems and is under the GPL-3.0-or-later license.
Rsync is written in C as a single threaded application. The rsync algorithm is a type of delta encoding, and is used for minimizing network usage. Zstandard, LZ4, or Zlib may be used for additional data compression, and SSH or stunnel can be used for security.
Rsync is typically used for synchronizing files and directories between two different systems. For example, if the command rsync local-file user@remote-host:remote-file is run, rsync will use SSH to connect as user to remote-host. Once connected, it will invoke the remote host's rsync and then the two programs will determine what parts of the local file need to be transferred so that the remote file matches the local one. One application of rsync is the synchronization of software repositories on mirror sites used by package management systems.
Rsync can also operate in a daemon mode (rsyncd), serving and receiving files in the native rsync protocol (using the "rsync://" syntax).
Andrew Tridgell and Paul Mackerras wrote the original rsync, which was first announced on 19 June 1996. It is similar in function and invocation to rdist (rdist -c), created by Ralph Campbell in 1983 and released under the Berkeley Software Distribution. Tridgell discusses the design, implementation, and performance of rsync in chapters 3 through 5 of his 1999 Ph.D. thesis. It is currently maintained by Wayne Davison.
Because of the flexibility, speed, and scriptability of rsync, it has become a standard Linux utility, included in all popular Linux distributions. It has been ported to Windows (via Cygwin, Grsync, or SFU), FreeBSD, NetBSD, OpenBSD, and macOS.
Similar to cp, rcp and scp, rsync requires the specification of a source and of a destination, of which at least one must be local.
Generic syntax:
rsync [OPTION] ... SRC .
Official source
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