Thanks for your reply. Each files contains information in number and alphabets. There are two things which I need from each file. One is the SCF Done that is energy like SCF Done =0.56846. Second is a column with electron delocalization papameter that a long column with number but column header is (EDu). I want to. 1. Which file among 200 files have lowest SCF Done. 2. Then I want to use the (EDu) column of this minimized SCF Done file from step 1 to get the difference of (EDu) of all remaining 199 files and want to get result in a text file. For example if (EDu) of minimum SCF Done file be (EDu)min. I want (EDu)min - (EDu)1, (EDu)min - (EDu)2.......... where 1, 2, 3..... represent the name of all files in the directory.

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