This could be more of unix question too. Since I am dealing with 'diff' within a perl script, thought of asking here. 

foreach $f (@isect) {

  print "diffing file $f \n";
  system("diff -r  $some_dir/$f $other_dir/$f" );
}

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isect array contains common elements of two other arrays (directories). when I do a diff between two directories for all the elements of isect, I want to ignore the identical elements (files). I want the diff to report only those files that differ.

for example one sample output would look like, as follows -

Intersect Array = 4 3
diffing file 4
4d3
< 1111
diffing file 3

[download]

In the above example, I don't want "diffing file 3" to be printed, since 'file 3' is an identical file between two arrays. I want to ignore files with no diff. I was looking for a switch for the diff command and did not find any. BTW, I don't have Diff.pm in my environment and that possibility is ruled out. Appreciate any help

In reply to Dealing with diff command within perl by surajsam

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