how to use klayout command line to compare two GDS?

hi @Matthias ,

I want to compare two gds file test.gds and test_new.gds, if same ignore it, if different copy test_new.gds to overwrite test.gds.
Then how should I compare these two GDS in command line?
I am using KLayout version 0.28.6, when I using following command:
klayout -b -rdiff -z -m -o diff.gds test.gds test_new.gds
got this error:
ERROR: Unknown option: -rdiff

klayout -b -mmerge -o merged.gds test.gds test_new.gds
ERROR: Unknown option: -mmerge



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