tldr/pages/linux/uuid.md

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# uuid
> Generate and decode Universally Unique Identifiers (UUID).
> See also `uuidgen`.
> More information: <https://manned.org/uuid>.
- Generate a UUIDv1 (based on time and system's hardware address, if present):
`uuid`
- Generate a UUIDv4 (based on random data):
`uuid -v {{4}}`
- Generate multiple UUIDv4 identifiers at once:
`uuid -v {{4}} -n {{number_of_uuids}}`
- Generate a UUIDv4 and specify the output format:
`uuid -v {{4}} -F {{BIN|STR|SIV}}`
- Generate a UUIDv4 and write the output to a file:
`uuid -v {{4}} -o {{path/to/file}}`
- Generate a UUIDv5 (based on the supplied object name) with a specified namespace prefix:
`uuid -v {{5}} ns:{{DNS|URL|OID|X500}} {{object_name}}`
- Decode a given UUID:
`uuid -d {{uuid}}`