systemd-id128(1) — Linux manual page


SYSTEMD-ID128(1)              systemd-id128             SYSTEMD-ID128(1)

NAME         top

       systemd-id128 - Generate and print sd-128 identifiers

SYNOPSIS         top

       systemd-id128 [OPTIONS...] new

       systemd-id128 [OPTIONS...] machine-id

       systemd-id128 [OPTIONS...] boot-id

       systemd-id128 [OPTIONS...] invocation-id

DESCRIPTION         top

       id128 may be used to conveniently print sd-id128(3) UUIDs. What
       identifier is printed depends on the specific verb.

       With new, a new random identifier will be generated.

       With machine-id, the identifier of the current machine will be
       printed. See machine-id(5).

       With boot-id, the identifier of the current boot will be printed.

       Both machine-id and boot-id may be combined with the
       --app-specific=app-id switch to generate application-specific
       IDs. See sd_id128_get_machine(3) for the discussion when this is

       With invocation-id, the identifier of the current service
       invocation will be printed. This is available in systemd
       services. See systemd.exec(5).

       With show, well-known IDs are printed (for now, only GPT
       partition type UUIDs), along with brief identifier strings. When
       no arguments are specified, all known IDs are shown. When
       arguments are specified, they must be the identifiers or ID
       values of one or more known IDs, which are then printed. Combine
       with --uuid to list the IDs in UUID style, i.e. the way GPT
       partition type UUIDs are usually shown.

OPTIONS         top

       The following options are understood:

       -p, --pretty
           Generate output as programming language snippets.

       -a app-id, --app-specific=app-id
           With this option, an identifier that is the result of hashing
           the application identifier app-id and the machine identifier
           will be printed. The app-id argument must be a valid sd-id128
           string identifying the application.

       -u, --uuid
           Generate output as an UUID formatted in the "canonical
           representation", with five groups of digits separated by
           hyphens. See the wikipedia[1] for more discussion.

       -h, --help
           Print a short help text and exit.

           Print a short version string and exit.

EXIT STATUS         top

       On success, 0 is returned, a non-zero failure code otherwise.

SEE ALSO         top

       systemd(1), sd-id128(3), sd_id128_get_machine(3)

NOTES         top

        1. wikipedia

COLOPHON         top

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       manager) project.  Information about the project can be found at
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       This page was obtained from the project's upstream Git repository
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       (which is not part of the original manual page), send a mail to

systemd 253                                             SYSTEMD-ID128(1)

Pages that refer to this page: sd-id128(3)sd_id128_get_machine(3)sd_id128_randomize(3)systemd.directives(7)systemd.index(7)