UUIDGEN(1) UUIDGEN(1) uuidgen - UUID uuidgen [] uuidgen ( ) (UUID) libuuid(3). UUID UUID, , UUID, . UUID, uuidgen: UUID , UUID UUID . , uuidgen UUID , . , UUID . UUID --random --time. UUID --md5 --sha1, --namespace - --name . - UUID, , UUID RFC 4122, @dns, @url, @oid @x500. . UUID , UUID , MD5 SHA1. , , , UUID , . . RFC, . -r, --random UUID. UUID, . , /dev/random. -t, --time UUID. UUID , ethernet , . -m, --md5 MD5. -s, --sha1 SHA1. -6, --time-v6 UUID. UUID , , , . -7, --time-v7 UUID. UUID , , , . -n, --namespace -. _- UUID <<@ns>>, <> UUID, (. ). -N, --name . -C, --count Generate multiple UUIDs using the enhanced capability of the libuuid to cache time-based UUIDs, thus resulting in improved performance. However, this holds no significance for other UUID types. -x, --hex . -h, --help . -V, --version . OSF DCE 1.1 uuidgen --sha1 --namespace @dns --name "www.example.com" uuidgen Andreas Dilger, libuuid(3). uuidparse(1), libuuid(3), RFC 4122 RFC XXXX uuidgen util-linux, Linux . util-linux 2.41 2025-03-29 UUIDGEN(1)