It's because "gmt end show" tries to open a PostScript file but there is no PostScript viewers installed. I think we need to check if gsview64c is available before calling it.
PreScript is Drawing & Typsetting DSL (or PostScript Interface) for Common Lisp. Roughly speaking, PreScript is PostScript represented as S-expressions (PostScript is ...
The 1-up, 2-up, and 6-up links will bring up a Postscript viewer, with 1, 2, or 6 slides per page, respectively. Use 1-up for browsing, and 2-up or 6-up for printing ...
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