NAME

       systemd-id128 - Generate and print sd-128 identifiers

SYNOPSIS

       systemd-id128 [OPTIONS...] new

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

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

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

DESCRIPTION

       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 useful.

       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 UUIDs are printed. When no arguments are specified, all known UUIDs
       are shown. When arguments are specified, they must be the names or values of one or more
       known UUIDs, which are then printed.

OPTIONS

       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.

       --version
           Print a short version string and exit.

EXIT STATUS

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

SEE ALSO

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

NOTES

        1. wikipedia
           https://en.wikipedia.org/wiki/Universally_unique_identifier#Format