Dear all I obtained a file (containing both of number and text) from a program in linux. I did changes in my file by text editor in windows. I changed order of the some lines. for example, before change, the order of lines was as follows: 1 2 3 4 5 . . . . 1000 and now, after the change: 1 2 7 8 3 . . . . 1000. When I use new file in the my program, I encountered with error (file format is changed and is not standard for program). But when I compared 2 files (old and new) by text editor in windows, I did not find difference. One of program developers suggested me to use unix diff tool. After using following command, diff tool did not give me output file or a text containing information about differences: *diff old.gr new.gro* I attached my files to this e-mail. Should I use diff by special option? How to fix this issue? Please guide me about that. Any help will highly appreciated. Best wishes for you.