SYSTEMD−ID128 - Online Linux Manual PageSection : 1
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Source : systemd 253
Note : systemd-id128

NAMEsystemd-id128 − Generate and print sd−128 identifiers

SYNOPSISsystemd−id128 [OPTIONS...] new systemd−id128 [OPTIONS...] machine−id systemd−id128 [OPTIONS...] boot−id systemd−id128 [OPTIONS...] invocation−id

DESCRIPTIONid128 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​.

OPTIONSThe 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 STATUSOn success, 0 is returned, a non−zero failure code otherwise​.

SEE ALSOsystemd(1), sd-id128(3), sd_id128_get_machine(3)

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