ypxfr(8) on OpenBSD
The text ef09230faee4, as OpenBSD 5.8, OpenBSD 5.7, OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4 shipped it.
get a YP map from YP server
Flags it lists
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-c -
-d -
-f -
-h -
-s