Having trouble running pde file from command line

hi, i can not help about the cygwin thing,
still i think that you first should confirm that processing-java works.

  • so when you say

I’m in the correct directory.

again, open a cmd window there?
yourdrive:/…/processing-3.4/
check with dir
that you see
processing-java.exe (26.07.2018)
and type

processing-java --sketch=yourdrive:/../processing-3.4/modes/java/examples/Basics/Image/LoadDisplayImage --run

it works here / win 7 / but full install processing 3.4 IDE

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