xy2sky(1) on Linux
The text d0b5f9179941, as Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
Compute RA Dec from X Y using WCS in FITS and IRAF image files
Flags it lists
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-a -
-b -
-d -
-e -
-f -
-g -
-i -
-j -
-m -
-n -
-q -
-t -
-v