Uucp
UUCP - Wikipedia, the free encyclopedia
UUCP is an abbreviation for Unix to Unix CoPy. ... The UUCP suite also includes uux (user interface for remote command execution) ...
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The UUCP Project
About the UUCP Project. The UUCP Maps. FAQ lists and other errata. Papers about UUCP protocols ... History of the UUCP Project. News. Questions/comments ...
www.uucp.org
UUCP: Information from Answers.com
bang path [now historical] An old-style UUCP electronic-mail address specifying hops to get from some assumed-reachable location to the addressee, so
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.uucp - Wikipedia, the free encyclopedia
uucp was a pseudo-domain-style suffix used in the late 1980s when identifying a ... As UUCP hosts were not always uniquely named, and there was no official global ...
en.wikipedia.org
UUCP
UUCP (Unix to Unix Copy) is used to support Usenet news service (which competes with the newer INN service) and can be used opti
www.comptechdoc.org
Linux Online - Sendmail+UUCP HOWTO
List of Linux HOWTO documents and other sources of help. ... Using and managing UUCP (Ed Ravin et al -- publisher O'reilly) which i think is ...
www.linux.org
UUCP@Everything2.com
UUCP was a protocol commonly used on non-networked UNIX ... basically eradicated UUCP. ... UUCP began in 1976 at AT&T/Bell Labs, when it was written by ...
everything2.com
Red Hat Tutorial - softlookup.com
HTML,CSS,JavaScript,DHTML
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The UUCP Project: History
An Early (1981) UUCP/USENET Map. The UUCP/USENET Backbone in 1984. Another 1984 Map ... Back to the Home Page of the UUCP Project. Questions/comments/problems
www.uucp.org
UUCP Internals Frequently Asked Questions
Although there are few books about UUCP, there are many about networks and protocols in general. ... Several UUCP protocols require an eight bit clean ...
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UUCP stands for Unix to Unix CoPy. The term generally refers to a suite of computer programs and communications protocols allowing remote execution of commands and transfer of Computer files, email and netnews between computers. Specifically, uucp is one of the programs in the suite; it provides a user interface for requesting file copy operations. The UUCP suite also includes uux (user interface for remote command execution), uucico (communication program), uustat (reports statistics on recent activity), uuxqt (execute commands sent from remote machines), and uuname (reports the uucp name of the local system).
Although UUCP was originally developed on and is most closely associated with Unix, UUCP implementations exist for several other operating systems, including Microsoft's MS-DOS, Digital's OpenVMS, Commodore's AmigaOS, and Mac OS.
Technology UUCP can use several different types of physical connections and link-layer protocols, but was most commonly used over dial-up connections. Before the widespread availability of Internet connectivity, computers were only connected by smaller private networks within a company or organization. They were also often equipped with modems so they could be used remotely from character-mode terminals via dial-up lines. UUCP uses the computers' modems to dial out to other computers, establishing temporary, point-to-point links between them. Each system in a UUCP network has a list of neighbor systems, with phone numbers, login names and passwords, etc. When work (file transfer or command execution requests) is queued for a neighbor system, the uucico program typically calls that system to process the work. The uucico program can also poll its neighbors periodically to check for work queued on their side; this permits neighbors without dial-out capability to participate.
Today, UUCP is rarely used over dial-up links, but is occasionally used over Internet protocol suite.
One example of the current use of UUCP is in the retail industry by Epicor|CRS Retail Solutions for transferring batch files between corporate and store systems via Transmission Control Protocol and dial-up on SCO OpenServer, Red Hat Linux, and Microsoft Windows (with Cygwin). The number of systems involved, as of early 2006, ran between 1500 and 2000 sites across 60 enterprises. UUCP's longevity can be attributed to its low/zero cost, extensive logging, native failover to dialup, and persistent queue management. However, this technology is anticipated to be retired in favor of other alternatives.
History UUCP was originally written at AT&T Bell Laboratories, by Mike Lesk, and early versions of UUCP are sometimes referred to as System V UUCP. The original UUCP was Rewrite (programming) by AT&T researchers Peter Honeyman, David A. Nowitz, and Brian E. Redman and the rewrite is referred to as HDB or HoneyDanBer uucp which was later enhanced, bug fixed, and repackaged as BNU UUCP ("Basic Network Utilities"). All of these versions had security holes which allowed some of the original computer worms to remotely execute unexpected shell commands, which inspired Ian Lance Taylor to write a new version from scratch. Taylor UUCP was released under the GNU General Public License and became the most stable and bug free version. Taylor UUCP also incorporates features of all previous versions of UUCP, allowing it to communicate with any other version with the greatest level of compatibility and even use similar config file formats from other versions. UUCP was also implemented for non-UNIX operating systems, most-notably MS-DOS systems. Packages such as UUPC, written by Drew Derbyshire and FSUUCP, written by Christopher Ambler, brought early Internet connectivity to personal computers, expanding the network beyond the interconnected university systems. FSUUCP formed the basis for many BBS packages such as Galacticomm's Major BBS and Mustang Software's Wildcat! BBS to connect to the UUCP network and exchange email and Usenet traffic. FSUUCP was notable for being the only other implementation of Taylor's enhanced 'i' protocol, a significant improvement over the standard 'g' protocol used by most UUCP implementations.
One surviving feature of uucp is the chat file format, largely inherited by the expect software package.
UUCP for mail routing The uucp and uuxqt capabilities could be used to send e-mail between machines, with suitable mail user interface and delivery agent programs. A simple uucp mail address was formed from the adjacent machine name, an exclamation mark or exclamation mark, followed by the user name on the adjacent machine. For example, the address barbox!user would refer to user user on adjacent machine barbox.
Mail could furthermore be routed through the network, traversing any number of intermediate nodes before arriving at its destination. Initially, this had to be done by specifying the complete path, with a list of intermediate host names separated by bangs. For example, if machine barbox is not connected to the local machine, but it is known that barbox is connected to machine foovax which does communicate with the local machine, the appropriate address to send mail to would be foovax!barbox!user.
User barbox!user might publish their UUCP email address in a form such as …!bigsite!foovax!barbox!user. This directs people to route their mail to machine bigsite (presumably a well-known and well-connected machine accessible to everybody) and from there through the machine foovax to the account of user user on barbox. Many users would suggest multiple routes from various large well-known sites, providing even better and perhaps faster connection service from the mail sender.
Bang paths of eight to ten machines (or hops) were not uncommon in 1981, and late-night dial-up UUCP links would cause week-long transmission times. Bang paths were often selected by both transmission time and reliability, as messages would often get lost. Some hosts went so far as to try to "Rewriting" the path, sending mail via "faster" routes — this practice tended to be frowned upon.
The "pseudo-domain" ending .uucp was sometimes used to designate a hostname as being reachable by UUCP networking, although this was never formally in the Internet root as a top-level domain.
UUCPNET and mapping UUCPNET was the name for the totality of the network of computers connected through UUCP. This network was very informal, maintained in a spirit of mutual cooperation between systems owned by thousands of private companies, universities, and so on. Often, particularly in the private sector, UUCP links were established without official approval from the companies' upper management. The UUCP network was constantly changing as new systems and dial-up links were added, others were removed, etc.
The UUCP Mapping Project was a volunteer, largely successful effort to build a map of the connections between machines that were open mail relays and establish a managed namespace. Each system administrator would submit, by e-mail, a list of the systems to which theirs would connect, along with a ranking for each such connection. These submitted map entries were processed by an automatic program that combined them into a single set of files describing all connections in the network. These files were then published monthly in a newsgroup dedicated to this purpose. The UUCP map files could then be used by software such as "pathalias" to compute the best route path from one machine to another for mail, and to supply this route automatically. The UUCP maps also listed contact information for the sites, and so gave sites seeking to join UUCPNET an easy way to find prospective neighbors.
Connections with the Internet Many uucp hosts, particularly those at universities, were also connected to the Internet in its early years, and e-mail gateways between Internet SMTP-based mail and UUCP mail were developed. A user at a system with UUCP connections could thereby exchange mail with Internet users, and the Internet links could be used to bypass large portions of the slow UUCP network. A "UUCP zone" was defined within the Internet domain namespace to facilitate these interfaces.
With this infrastructure in place, UUCP's strength was that it permitted a site to gain Internet e-mail connectivity with only a dial-up modem link to another cooperating computer. This was at a time when true Internet access required a leased data line providing a connection to an Internet Point of Presence, both of which were expensive and difficult to arrange. By contrast, a link to the UUCP network could usually be established with a few phone calls to the administrators of prospective neighbor systems. Neighbor systems were often close enough to avoid all but the most basic charges for telephone calls.
Decline UUCP usage began to die out with the rise of Internet Service Providers offering inexpensive Serial Line IP and Point-to-Point Protocol services. The UUCP Mapping Project was formally shut down in late 2000.
Usenet traffic was originally transmitted using the UUCP network, and bang paths are still in use within Usenet message format Path header lines. They now have only an informational purpose, and are not used for routing, although they can be used to ensure that loops do not occur. In general, this form of e-mail address has now been superseded by the Simple mail transfer protocol "@ notation", even by sites still using uucp.
Currently UUCP is used mainly over high cost links (e.g., marine satellite links). UUCP over TCP/IP (preferably encrypted, such as via the Secure Shell protocol) can be used when a computer doesn't have any fixed IP addresses but is still willing to run a standard mail transfer agent (MTA) like Sendmail or Postfix (software).
See also
- routing
- sitename
- Wizzy Digital Courier — low-cost internet delivery system using UUCP
External links
- Using & Managing UUCP. Ed Ravin, Tim O'Reilly, Dale Doughtery, and Grace Todino. 1996, O'Reilly & Associates, Inc. ISBN 1-56592-153-4
- Mary Ann Horton (1986). RFC 976: UUCP Mail Interchange Format Standard. Internet Engineering Task Force Requests for Comment.
- UUCP Internals Frequently Asked Questions
- Setting up Taylor UUCP + qmail on FreeBSD 5.1
- Taylor UUCP is a GNU General Public License licensed UUCP package.
- Taylor UUCP Documentation - useful informations about UUCP in general and various uucp protocols.
- Usenet Logical Map, July 24, 1984
- The UUCP Project: History
The UUCP Project
Questions/comments/problems? Send mail to: inquiry@uucp.org
The UUCP Project: Papers
The UUCP Project: Papers Last updated: The UUCP 'g' protocol: Jamie Hanrahan (DECUS) G. L. Chesson (also PostScript) Chuck Wegrzyn The UUCP 't' protocol:
UUCP - Wikipedia, the free encyclopedia
UUCP stands for Unix to Unix CoPy. The term generally refers to a suite of computer programs and protocols allowing remote execution of commands and transfer of files, email and ...
.uucp - Wikipedia, the free encyclopedia
uucp was a pseudo-domain-style suffix used in the late 1980s when identifying a hostname not connected directly to the Internet but possibly reachable through inter-network ...
UNIX man pages : uucp ()
1994 Man-cgi 1.15, Panagiotis Christias
The Linux UUCP HOWTO
The Linux UUCP HOWTO Guylhem Aznar v2.0.1, 2001-12-01
ManagingTaylor UUCP
UUCP was designed in the late seventies by Mike Lesk at AT&T Bell Laboratories to provide a simple dialup network over public telephone lines.
uucp-1.07
uucp-1.07: This is the complete source code for a Unix UUCP package: Description: It provides everything you need to make a UUCP connection. It includes versions of uucico, uusched ...
UUCP Technology
Introduction. Unix to Unix CoPy Collection of programs, allow machines to communicate via modems and regular telephone lines Dial-up Network, store and forward system E-mail and ...
Unix to Unix Copy from FOLDOC
uucp ==> Unix to Unix Copy < networking, messaging > (uucp) A Unix utility program and protocol that allows one Unix system to send files to another via a serial line which may be ...