Why do GUIDs have hyphens?

Why do GUIDs have hyphens?

NET GUID? for a detailed explanation. Long sequences are very hard to parse for humans, hence the hyphens. But GUID itself is just a number, so you can drop them.

What is the format of a UUID?

Format. 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).

Why is UUID hyphenated?

UUIDs are also sometimes stored as a base64 or ascii85 encoded string to save space for transmission over transports that are not binary-safe, and adherence to the RFC is not required. Hyphens denote the byte structure of a Guid. You can probably strip them before saving.

How do I generate a UUID?

The procedure to generate a version 4 UUID is as follows:

1. Generate 16 random bytes (=128 bits)
2. Adjust certain bits according to RFC 4122 section 4.4 as follows:
3. Encode the adjusted bytes as 32 hexadecimal digits.
4. Add four hyphen “-” characters to obtain blocks of 8, 4, 4, 4 and 12 hex digits.

Is there any difference between a GUID and an UUID?

A GUID and a UUID are essentially the same thing. The only difference is the CONTEXT of how they are used. GUIDs are normally associated with COM/ActiveX. UUIDs are more general. To make a GUID/UUID from a COMMAND LINE use the UUIDGEN command in the Visual Studio COMMON tools: UUIDGEN >mynewuuid.txt. Thanks for your answer.

What is the difference between Guid and UUID?

defined by RFC 4122.

What is UUID or universally unique identifier?

Definition – What does Universally Unique Identifier (UUID) mean? A universally unique identifier (UUID) is a 128-bit number that identifies unique Internet objects or data. A UUID is generated by an algorithm with values that are based on a machine’s network address.

How do I generate UUID?

An easy way to generate UUIDs in Linux is to use the uuidgen utility on the Linux/ Unix command line. Generating UUID with uuidgen. Simply executing uuidgen will generate a random UUID. Using the -t option will create a UUID based on system time and ethernet address if available.