SYSTEMD-ID128(1) systemd-id128 SYSTEMD-ID128(1)
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 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
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
systemd 252 SYSTEMD-ID128(1)
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