- #Linux uuid generator generator
- #Linux uuid generator registration
- #Linux uuid generator software
- #Linux uuid generator code
#Linux uuid generator code
The four-bit M and the 1 to 3 bit N fields code the format of the UUID itself. In its canonical textual representation, the 16 octets of a UUID are represented as 32 hexadecimal (base-16) digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 hexadecimal characters and 4 hyphens). The Internet Engineering Task Force (IETF) published the Standards-Track RFC 4122, technically equivalent to ITU-T Rec. UUIDs are documented as part of ISO/ IEC 11578:1996 " Information technology – Open Systems Interconnection – Remote Procedure Call (RPC)" and more recently in ITU-T Rec.
#Linux uuid generator software
UUIDs are standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE). When in July 20 was published as a proposed IETF standard, the ITU had also standardized UUIDs, based on the previous standards and early versions of RFC 4122. RFC 4122 registered a URN namespace for UUIDs and recapitulated the earlier specifications, with the same technical content. Later, the Microsoft Windows platforms adopted the DCE design as "globally unique identifiers" (GUIDs). The initial design of DCE UUIDs was based on the NCS UUIDs, whose design was in turn inspired by the ( 64-bit) unique identifiers defined and used pervasively in Domain/OS, an operating system designed by Apollo Computer. In the 1980s Apollo Computer originally used UUIDs in the Network Computing System (NCS) and later in the Open Software Foundation's (OSF) Distributed Computing Environment (DCE). 6.4 Versions 3 and 5 (namespace name-based).6.3 Version 2 (date-time and MAC address, DCE security version).6.2 Version 1 (date-time and MAC address).Information labeled with UUIDs by independent parties can therefore be later combined into a single database or transmitted on the same channel, with a negligible probability of duplication.Īdoption of UUIDs is widespread, with many computing platforms providing support for generating them and for parsing their textual representation. Thus, anyone can create a UUID and use it to identify something with near certainty that the identifier does not duplicate one that has already been, or will be, created to identify something else. While the probability that a UUID will be duplicated is not zero, it is close enough to zero to be negligible.
#Linux uuid generator registration
Their uniqueness does not depend on a central registration authority or coordination between the parties generating them, unlike most other numbering schemes.
When generated according to the standard methods, UUIDs are, for practical purposes, unique. The term globally unique identifier ( GUID) is also used. Conforming toĪuthor uuidgen was written by Andreas Dilger for libuuid.A universally unique identifier ( UUID) is a 128-bit label used for information in computer systems. This method creates a UUID based on the system clock plus the system's ethernet hardware address, if present. It requires that the operating system have a high quality random This method creates a UUID consisting mostly of random bits. One of these two UUID types by using the -r or -t options. It is possible to force the generation of Otherwise, it will chose a time-based UUID.
#Linux uuid generator generator
Random-based UUID if a high-quality random number generator is present. There are two types of UUID's which uuidgen can generate: time-based UUID's and random-based UUID's. The new UUID can reasonably be considered unique among all UUIDs created on the local system, and among UUIDsĬreated on other systems in the past and in the future. The uuidgen program creates (and prints) a new universally unique identifier (UUID)
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