I owe my entire career to GWBASIC, QBasic, and Turbo Pascal, all of which was done from an IBM PC. When I first discovered UNIX by way of Red Hat Linux I was utterly confused: all of those absurdly named directories in my root! And where were the executables? I remember pecking out some C in nano, compiling it, and then wondering how the hell you turn a.out into a.exe.