So my question is, have a missed something?

hmm... the output of your last script

$VAR1 = [
          'Only in test1/: different1',
          'Only in test2/: different2',
          'Only in test2//common: common.txt~',
          'Files test1//common/common.txt and test2//common/common.txt
+ differ'
        ];
--- test1//common/common.txt    Wed Mar  8 11:41:08 2017
+++ test2//common/common.txt    Wed Mar  8 11:44:35 2017
@@ -1 +1 @@
-This is a common line
+This is a common line.

[download]

is very similar to the output diff -ru produces: 

qwurx [shmem] ~/tmp/diff> diff -ur test1 test2
diff -ur test1/common/common.txt test2/common/common.txt
--- test1/common/common.txt    2017-03-09 12:28:15.215474776 +0100
+++ test2/common/common.txt    2017-03-09 12:28:38.639837796 +0100
@@ -1 +1 @@
-This is a common line
+This is a common line.
Only in test2/common: common.txt~
Only in test1: different1
Only in test2: different2

[download]

and it is trivial to filter that output to resemble that of your script.
Perhaps you want to tell us what kind of output you are aiming for, and the purpose of it all?

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

In reply to Re: Recursive Directory Comparison and Export Differences by shmem
in thread Recursive Directory Comparison and Export Differences by thanos1983

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