help with diff

Simon Matthews spm at
Tue Dec 29 15:19:39 GMT 2009

* A Smith (asmith9983 at [091229 14:40]:
> I'm trying unsuccessfully to use the "--GTYPE-group-format=" option to diff
> to try and extract lines  only in file1, not file2, but I must be
> mis-understanding the syntax as I only get an option error from diff!

Looking at the 'diff' manual:
       LTYPE is `old', `new', or `unchanged'.
              GTYPE is LTYPE or `changed'.

So the option needs to be something like --old-group-format=...

However, based on what you are trying to do, the command 'comm' might be
more appropriate.


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