new-wcs(1) on Linux
The text b45f66c2cf25, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
Merge a WCS solution with existing FITS header cards
Flags it lists
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-d -
-o -
-v -
-w