If you are fond of the command line, which I am sure most any reader of this community is, you should try linux. It is command line driven just the same. If you don't believe me, check out a sampling of the commands. (The first is DOS, the second is Linux)
cd, cd mkdir, mkdir cd\, cd ~ dir, ls copy, cp move, mv del, rm find, find
I started using Linux before the 1.0 kernel (Slackware, baby!) when the GUI was a new phenomenon. There is a lot of crossover, even these days. If you like DOS, you may just love Linux.