pssegy(1gmt) on Linux
The text bf35ec077f32, as Debian 8 (Jessie) shipped it.
Create imagemasked postscript from SEGY file
Flags it lists
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-A -
-B -
-C -
-D -
-E -
-F -
-I -
-J -
-K -
-L -
-M -
-N -
-O -
-P -
-R -
-S -
-T -
-U -
-V -
-W -
-X -
-Y -
-Z