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The difference between end number in the early row and the start number in the next

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http://www.unix.com – Hi Power User, I'm trying to compute this kind of text file format: file1:  jakarta 100 150jakarta 170 210beijing 220 250beijing 260 280beijing 290 320new_york 330 350 new_york 370 420tokyo 430 470tokyo 480 485seoul 490 540seoul 570 590seoul 640 680seoul 730 750singapur 780 830singapur 860 940. . .. . .. . .p b eThe explanation, the desired data is the difference between the end number in the town in the early row and the start number in the town in the next row. The numerical difference betwe (HowTos)