> True, but unfamiliar and hard to learn combine to make it forbidding to newcomers. > Case in point: https://retrocomputing.stackexchange.com/questions/26398/

> True, but unfamiliar and hard to learn combine to make it forbidding to newcomers. > Case in point: https://retrocomputing.stackexchange.com/questions/26398/how-does-one-customize-the-3270-terminal-login-screen-in-vm-370 https://retrocomputing.stackexchange.com/questions/26398/how... Though that's MVS, which probably should no be conflated with OS/400. The former is all kinds of trouble because it maintains compatibility with stuff from really old and limited systems, while the latter is quite a bit newer than UNIX so could have alien-advanced "science fiction" features.