> Can you be explicit with what they are missing, I’m clearly missing it as well? There are two cases when a CLI program can print its usage 1. when the `--he

> Can you be explicit with what they are missing, I’m clearly missing it as well? There are two cases when a CLI program can print its usage 1. when the `--help` option, or often also the short-option `-h`, is passed to the program 2. When the user passes a wrong option to the program, where first the error is printed and then often also the general usage. For 1. the output always should be on stdout, but for 2. the error should be on stderr, and it might be warranted that in that case the usage might be printed on stderr too, so that all is on the same stream. Doing 2. is not a must though, one can also go for an output like: > error message > Try 'program-name --help' for more information This avoids "hiding" the actual error in the often rather big amount of usage-text while still hinting how to get information about what options the program expects and/or accepts.