uuidgen(1) on FreeBSD
The text 9d27077ac180, as FreeBSD 5.5-RELEASE, FreeBSD 5.4-RELEASE, FreeBSD 5.3-RELEASE, FreeBSD 5.2.1-RELEASE, FreeBSD 5.2-RELEASE, FreeBSD 5.1-RELEASE shipped it.
generate universally unique identifiers
Flags it lists
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-1 -
-n -
-o