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


systemd-id128 - Generate and print sd-128 identifiers


systemd-id128 [OPTIONS...] new

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

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

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


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).


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.

-h, --help

Print a short help text and exit.


Print a short version string and exit.


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


systemd(1), sd-id128(3), sd_id128_get_machine(3)
systemd 241