Tcl Library Source Code
uuid - uuid
Not logged in
Bounty program for improvements to Tcl and certain Tcl packages.
Tcl 2018 Conference, Houston/TX, US, Oct 15-19
Send your abstracts to
or submit via the online form by Aug 20.

[ Main Table Of Contents | Table Of Contents | Keyword Index | Categories | Modules | Applications ]

uuid(n) 1.0.4 tcllib "uuid"


uuid - UUID generation and comparison


  • package require Tcl 8.5
  • package require uuid ?1.0.4?


This package provides a generator of universally unique identifiers (UUID) also known as globally unique identifiers (GUID). This implementation follows the draft specification from (1) although this is actually an expired draft document.


::uuid::uuid generate

Creates a type 4 uuid by MD5 hashing a number of bits of variant data including the time and hostname. Returns the string representation of the new uuid.

::uuid::uuid equal id1 id2

Compares two uuids and returns true if both arguments are the same uuid.


% uuid::uuid generate


  1. Paul J. Leach, "UUIDs and GUIDs", February 1998. (

Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category uuid of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.


Hashes, checksums, and encryption