How to compare the DEF generated by 2 different layouts

Hi,
I am generating the DEF from GDS and OAS of same design. Right now I am importing DEF in Klayout and using XOR tool to find the layout differences. It works great. Now, I need to use it in batchmode. Is there any suggestion?
I tried using strmcmp .But I got an error saying unrecognized format?

Please help me.

Thanks
Dinesh

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