Dear Sergio, I'd traverse the dirs by means of a glob and build the following two hashes
%content with the dirs $dir as keys and a reference to an array or hash of the numbers contained in any file of $dir; in case you cannot guarantee that any number occurs only once I would opt for the hash as this would allow to (1) count the occurances for each number as the hash value and (2) retrieve a list of the distinct numbers by calling the keys builtin on the hash. %index with the numbers $number as keys and a reference to an array of the dirs containing a file that contains $number. Hope this helps Mathias -- _____________________________________________________________________ )_______ )_______ Dr. Mathias Kratzer )_______ Head of Library Network Services )_______ Bavarian Library Network (BVB) / Head Office )_______ Bavarian State Library )_______ Ludwigstraße 16 )_______ D-80539 München )_______ Phone# +49 89 28638-2797 | Fax# +49 89 28638-2605 )____________________________________________________________________ >>> On Freitag, 23. September 2016 at 08:48, Sergio Letuche <code4libus...@gmail.com> wrote: > hello community, > > Say we have the following structure in our filesystem: > > dir1 > dir2 > dir3 > dir4 > > dir stands for directory of course. > > In dir1, there is a file1.txt that has in it numbers, like below > > 6576576 898798789 5645436549 76567576576 876876876876 > > Same goes for dir2. In dir2, there is a file2.txt, that has in it numbers, > like below > > 6576576 89879878963 56454365492 765675765763 8768768768765 > > And so with all the rest of the folders. > What we need to do, is have a new file (like an index) out of all > directories and files values, like below: > > dir1;6576576,898798789,5645436549,76567576576,876876876876 > dir2;6576576,89879878963,56454365492,765675765763,8768768768765 > > And secondly, another index file, which will have the reverse info > > 6576576;dir1,dir2 > > Any ideas on how would you approach this? > > Best
