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I have two files (in a project’s source code base) which I often want to compare visually in FileMerge, as part of a regular routine. I’m trying to script that routine for efficiency, but am stuck on automating this step. Is there a single shell command which will open two files for comparison in FileMerge?

I tried open file1.txt -a FileMerge as a starting point, but this fails with an error message:

[…] FileMerge cannot open files in the “text” format.

1 Answer 1

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To call FileMerge from the commandline, use opendiff:

opendiff file1.txt file2.txt

This will open Filemerge with the two files open and diff'd.

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