ypxfr(8) on OpenBSD
The text a5b904e3afce, as OpenBSD 6.8, OpenBSD 6.7, OpenBSD 6.6, OpenBSD 6.5, OpenBSD 6.4, OpenBSD 6.3, OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9 shipped it.
get a YP map from YP server
Flags it lists
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-c -
-d -
-f -
-h -
-s