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$ diff -r test1/ test2/
diff -r test1/common/common.txt test2/common/common.txt
...
Only in test2/common: common.txt~
Only in test1/: different1
Only in test2/: different2

#!/usr/bin/perl
use strict;
...
Only in test2/common: common.txt~
Only in test1: different1
Only in test2: different2

#!/usr/bin/perl
use strict;
...
@@ -1 +1 @@
-This is a common line
+This is a common line.