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For Python, we could use something like Python Code Clone Detector
But i just could not find anything for Perl.
With reference to DRY, Catalyst mentions that its build on DRY principle. and if it is i would imagine some tool might have been used to verify that claim.
Furthermore does Perl promote DRY or not ? I know for sure it promotes repeat Others by using CPAN.
You probably mean “Perl promotes ‘do not repeat others’ by providing CPAN”, and that is certainly true.
However, DRY is more of a general programming principle (write many specialized, small functions that can be parametrized properly by their arguments instead of writing monolithic functions that “do it all”) than a language feature. You can write DRY-compliant code in C++, Python, Perl, Ruby, C and most others. Some languages require more boilerplate, some less.
Perl definitely allows for small functions with few boilerplate by providing concise language constructs.
I don’t know of tools detecting non-DRY code for Perl, though.