If you want to kill lines that start with // then you need to anchor it 
to the beginning of the line with ^.  If you want to also get comments 
that start with spaces or tabs you can also add \s to match white space 
followed by a * to match 0 or more occur aces of white space.

So the line you would want to use would look like:

diff -I '^\s*//' file1 file2

Also note that I put it in single quotes to keep the shell from escaping 
some characters.

Brian Cluff

On 10/22/2012 01:59 PM, Eric Cope wrote:
> Hi all,
> I am trying to diff between two sets of files. I want to ignore comments
> (lines that start with //).
> I've tried
>
>   * diff -I "//" file1 file2
>   * diff -I "\/\/" file1 file2
>   * diff -I "//.* file1 file2
>
> among others. Has anyone successfully used diff and its ignore option?
>
> Thanks,
> Eric
>
>
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