I still remember the day in 1976 when Gary Kildall typed in "dir" to an "A>" prompt on his hazeltine green-screen character display to show me a directory listing on his 8080-based, eight-bit computer running the first release of CP/M, the first real microcomputer operating system (that Gary wrote). He gave me a shy but proud look and asked what I thought. It seemed miraculous to me, and I was hooked. Anyway, I just tried to rename a file on my Windows 10 PC and midway through the operation Microsoft deleted the file instead. I guess we've really come a long way since those early days 50 years ago.