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The rsync utility uses an algorithm invented by the Australian computer programmer Andrew Tridgell for efficiently transmitting a structure ( such as a file ) across a communications link when the receiving computer already has a similar, but not identical, version of the same structure.
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rsync and utility
Because of the flexibility, speed and scriptability of rsync, it has become a standard Linux utility and is included in all popular Linux distributions.
A utility called uses the rsync algorithm to generate delta files with the difference from file A to file B ( like the utility diff, but in a different delta format ).
A " rolling checksum " version of Adler-32 is used in the rsync utility.
The service is distributed worldwide, with twelve mirror sites in twelve countries on five continents, with the database synchronized by means of weekly updates using rsync, a mirroring utility which allows updates to only the portions of the database which have changed.
rsync and uses
He also was the original author of rzip, which uses a similar algorithm to rsync.
* The rsync remote file synchronizer, which uses zlib to implement optional protocol compression.
rsync uses the ' rsync algorithm ' which provides a very fast method for bringing remote files into sync.
Although Monotone originally supported a variety of networking protocols for synchronizing trees, it now exclusively uses a custom protocol called netsync, which is more robust and efficient, and shares some conceptual ground with rsync and cvsup.
* It uses the rsync algorithm developed by Andrew Tridgell.
rsync and algorithm
Andrew " Tridge " Tridgell ( born 28 February 1967 ) is an Australian computer programmer best known as the author of and contributor to the Samba file server, and co-inventor of the rsync algorithm.
For his PhD thesis, he co-developed rsync, including the rsync algorithm, a highly efficient file transfer and synchronization tool.
While the rsync algorithm forms the heart of the rsync application that essentially optimizes transfers between two computers over TCP / IP, the rsync application supports other key features that aid significantly in data transfers or backup.
They include compression and decompression of data block by block using zlib at sending and receiving ends, and support for protocols such as ssh that enables encrypted transmission of compressed and efficient differential data using rsync algorithm.
A rolling-checksum algorithm based on the one in rsync is used to locate potential matches from over such a large dataset.
* rsync, by the same author ( Andrew Tridgell ) and containing a similar matching / search algorithm to the first-stage of rzip.
rsync and by
rsync is a software application and network protocol for Unix-like systems with ports to Windows that synchronizes files and directories from one location to another while minimizing data transfer by using delta encoding when appropriate.
This allows for the low-overhead data transfer achieved by rsync while providing encryption for secure transfer and storage of sensitive data in a remote location.
CiteSeerX also shares its software, data, databases and metadata with other researchers, currently by Amazon s3 and by rsync.
MD4 is also used by the rsync protocol.
rsync and Australian
Tridgell discusses the design, implementation and performance of rsync in chapters 3 through 5 of his Australian National University Ph. D. thesis.
rsync and Andrew
Andrew Tridgell and Paul Mackerras wrote the original rsync.
* Andrew Tridgell worked on samba, rsync
rsync and for
Quoting the official website: " rsync is a file transfer program for Unix systems.
rsync was originally written as a replacement for rcp and scp.
One of the earliest applications of rsync was to implement mirroring or backup for multiple Unix clients to a central Unix server using rsync / ssh and standard Unix accounts.
The Apache HTTP Server supports only rsync for updating mirrors.
This allows easy mirroring of HTTP and FTP sites, but is considered inefficient and more error-prone when compared to programs designed for mirroring from the ground up, such as rsync.
The Parchive and rsync utilities are often preferred for verifying that a file has not been accidentally corrupted in transmission, since they can correct common small errors with a much shorter download.
rsync and efficiently
* In combination with rsync to back up, copy and mirror files efficiently and securely
rsync and such
In daemon mode, rsync listens on the default TCP port of 873, serving files in the native rsync protocol or via a remote shell such as RSH or SSH.
rsync and file
* Remote file transfer / synchronization: ftp, scp, rsync, unison, rtorrent
Finally, rsync is capable of limiting the bandwidth consumed during a transfer, a useful feature that few other standard file transfer programs offer.
rsync and has
As a result, rsync has been ported to Windows ( via Cygwin, Grsync or SFU ) and Mac OS.
Other open-source software projects he has either maintained or helped to maintain include screen, patch, rsync ( current maintainer ), zsh, pop-before-smtp ( current maintainer ), and rbmake ( current maintainer ).
rsync and similar
" An important feature of rsync not found in most similar programs / protocols is that the mirroring takes place with only one transmission in each direction.
rsync and version
Released under the GNU General Public License version 3, rsync is free software.
( Prior to version 30 of the protocol, released with rsync version 3. 0. 0, it used MD4 hashes rather than MD5.
rsync and .
rsync can copy or display directory contents and copy files, optionally using compression and recursion.
In the latter case, the rsync client executable must be installed on the remote machine as well as on the local machine.
rsync was first announced on 19 June 1996.
utility and uses
Menger did not embrace this hedonic conception, explained diminishing marginal utility in terms of subjective prioritization of possible uses, and emphasized disequilibrium and the discrete ; further Menger had an objection to the use of mathematics in economics, while the other two modeled their theories after 19th century mechanics.
The basic reason is that no productive factor with a non-zero marginal product is left unutilized, and the units of each factor are so allocated as to yield the same indirect marginal utility in all uses, a basic efficiency condition ( if this indirect marginal utility were higher in one use than in other ones, a Pareto improvement could be achieved by transferring a small amount of the factor to the use where it yields a higher marginal utility ).
Monopoly violates this optimal allocation condition, because in a monopolized industry market price is above marginal cost, and this means that factors are underutilized in the monopolized industry, they have a higher indirect marginal utility than in their uses in competitive industries.
Since plug-ins and extensions both increase the utility of the original application, Mozilla uses the term " add-on " as an inclusive category of augmentation modules that consists of plug-ins, themes, and search engines.
On Unix-like operating systems, the traceroute utility by default uses User Datagram Protocol ( UDP ) datagrams with destination port numbers from 33434 to 33534.
Although the extent-based nature of XFS and the delayed allocation strategy it uses significantly improves the file system's resistance to fragmentation problems, XFS provides a filesystem defragmentation utility (, short for XFS filesystem reorganizer ) that can defragment the files on a mounted and active XFS filesystem.
The traditional truck-based SUV is gradually being supplanted by the crossover SUV, which uses an automobile platform for lighter weight and better fuel efficiency, as a response to much of the criticism of sport utility vehicles.
This, combined with their increased speed, is expected to improve their utility in populated areas for commercial uses and reduce the threat of detection for military uses.
Instead of reducing every activity by a fifth, the farmer simply starved the parrots as they were of less utility than the other four uses ; in other words they were on the margin.
The rkhunter utility uses SHA-1 hashes to verify the integrity of system files.
Instead of reducing every activity by a fifth, the farmer simply starved the parrots as they were of less utility than the other four uses – in other words, they were on the margin.
A decision tree is a decision support tool that uses a tree-like graph or model of decisions and their possible consequences, including chance event outcomes, resource costs, and utility.
Since plug-ins and extensions both increase the utility of the original application, Mozilla uses the term " add-on " as an inclusive category of augmentation modules that consists of plug-ins, themes, and search engines.
* < tt > ack </ tt >, a command-line utility similar to grep that uses the more extensive Perl regular expressions
The configuration system is designed to be very easy to understand and use, without being restrictive ; FREESCO's setup utility uses a system of informative menus and prompts, with almost no need for the manual editing of configuration files.
* Rational Choice with Passion: Virtue in a Model of Rational Addiction-In this link the author uses Aristotelian virtue as a mediator between passion and reason in the construction of utility / consumption functions in an esoteric part of consumer behaviour theory related to decision making in addictive situations.
JCL uses a number of IBM utility programs to assist in the processing of data.
If transferring FileVault data from a previous Mac that uses 10. 4 using the built-in utility to move data to a new machine, the data continues to be stored in the old sparse image format, and the user must turn FileVault off and then on again to re-encrypt in the new sparse bundle format.
** Centrica, a multinational utility company founded in 1997, which currently uses the British Gas brand name in the UK
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