gmt(1gmt) on Linux
The text 49cd2faa5c85, as Debian 9 (Stretch) shipped it.
The Generic Mapping Tools data processing and display software package
Flags it lists
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-: -
-K -
-O -
-P -
-V -
-c -
-di -
-do -
-i -
-o -
-r -
-t