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Thanks igor for the solution., but only works if the file doesn't have "|" in the data.

since its fixed lenght file, there is no guarantee that i will only get data without "|" in the data.
...

sample input
515341|515310000047363758741
515341|515330100047363758741
515342|515360000020063758742
515349|515370000047363758749


desired output

515310000047363758741...

Hi

How to sort a fixed length file on a given char range and just display the duplicates.

I did search for man sort to find any option but could find any.,something similar to cut -c 1-5,25-35....