I tried with text::diff, file::compare, list::compare and hash of array concept and module but the output I want in error.txt is just the position of mismatch like line no., The logic might be check mismatch line by line and whatever the mismatch found just grab that line no. of file 2 and print in the error file one by one.

I really appreciate that you help me

but can you do some modification

thanks a lot