| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | .\" Copyright 1999 Andreas Dilger (adilger@enel.ucalgary.ca) |
| 2 | .\" |
| 3 | .\" This man page was created for libuuid.so.1.1 from e2fsprogs-1.14. |
| 4 | .\" |
| 5 | .\" This file may be copied under the terms of the GNU Public License. |
| 6 | .\" |
| 7 | .\" Created Wed Mar 10 17:42:12 1999, Andreas Dilger |
| 8 | .TH UUIDGEN 1 "@E2FSPROGS_MONTH@ @E2FSPROGS_YEAR@" "E2fsprogs version @E2FSPROGS_VERSION@" |
| 9 | .SH NAME |
| 10 | uuidgen \- command\-line utility to create a new UUID value |
| 11 | .SH SYNOPSIS |
| 12 | .B uuidgen |
| 13 | [ |
| 14 | .B \-r |
| 15 | | |
| 16 | .B \-t |
| 17 | ] |
| 18 | .SH DESCRIPTION |
| 19 | The |
| 20 | .B uuidgen |
| 21 | program creates (and prints) |
| 22 | a new universally unique identifier (UUID) using the |
| 23 | .BR libuuid (3) |
| 24 | library. The new UUID can reasonably be considered unique among |
| 25 | all UUIDs created on the local system, |
| 26 | and among UUIDs created on other systems in the past |
| 27 | and in the future. |
| 28 | .PP |
| 29 | There are two types of UUID's which |
| 30 | .B uuidgen |
| 31 | can generate: time-based UUID's and random-based UUID's. By |
| 32 | default |
| 33 | .B uuidgen |
| 34 | will generate a random-based UUID if a high-quality random number |
| 35 | generator is present. Otherwise, it will chose a time-based UUID. It |
| 36 | is possible to force the generation of one of these two |
| 37 | UUID types by using the |
| 38 | .B \-r |
| 39 | or |
| 40 | .B \-t |
| 41 | options. |
| 42 | .SH OPTIONS |
| 43 | .TP |
| 44 | .B \-r |
| 45 | Generate a random-based UUID. This method creates a UUID consisting mostly |
| 46 | of random bits. It requires that the operating system have a high |
| 47 | quality random number generator, such as |
| 48 | .IR /dev/random . |
| 49 | .TP |
| 50 | .B \-t |
| 51 | Generate a time-based UUID. This method creates a UUID based on the system |
| 52 | clock plus the system's ethernet hardware address, if present. |
| 53 | .SH "CONFORMING TO" |
| 54 | OSF DCE 1.1 |
| 55 | .SH AUTHOR |
| 56 | .B uuidgen |
| 57 | was written by Andreas Dilger for libuuid. |
| 58 | .SH AVAILABILITY |
| 59 | .B uuidgen |
| 60 | is part of libuuid from the e2fsprogs package and is available from |
| 61 | http://e2fsprogs.sourceforge.net. |
| 62 | .SH "SEE ALSO" |
| 63 | .BR libuuid (3) |