pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-31579-Rev20181010.ps) >>/Users/jc/w/tmp/Tune-31579-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/Finland/Rev20181010.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Coll_31579.log 459955 Log file, useful mostly for debugging
Tune-31579-Rev20181010.abc 10245 ABC music file with the extracted tune(s)
Tune-31579-Rev20181010.ps 132454 PostScript
Tune-31579-Rev20181010.txt 10245 Plain-text file with the extracted tune(s)
Tune-31579-get.log 16174 Log file, useful mostly for debugging
These files should be available for 24 hours.