Man1 - systemd-id128.1
Table of Contents
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)