If you are on a quest to get rid of your desktop environment and do everything from the console, well good luck with that. However, if you are a bit more serious, and would like to learn to do a new thing from the terminal, what about mastering spreadsheets?
Sure, LibreOffice or any office suite of your choice may do it very well in the first place, but sometimes using a pick up truck to go to the kitchen is not the most appropriate path. What I mean by that is that it happens that you may need to create a quick spreadsheet with just a few simple formulas, but nothing so complicated that you need all the power of a traditional office suite.