gconcat(8) on FreeBSD
The text 9f84df6a8091, as FreeBSD 14.5-RELEASE, FreeBSD 14.4-RELEASE, FreeBSD 14.3-RELEASE, FreeBSD 14.2-RELEASE, FreeBSD 14.1-RELEASE, FreeBSD 14.0-RELEASE shipped it.
disk concatenation control utility
Flags it lists
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-f -
-h -
-v