While this is a fine workflow if you're more familiar with command line tools than Excel, bulk changes are usually easily doable in Excel with judicious use of

While this is a fine workflow if you're more familiar with command line tools than Excel, bulk changes are usually easily doable in Excel with judicious use of cell formulas and copy-pasting of values. On a lark, I did a couple dozen Euler problems in Excel a couple years ago and found it was actually quicker and easier than doing it in a 'real' programming language; at least part of that is that loops and recursions are easy to visualize and debug in Excel because you can just break intermediate calculations into cells.