The CLI works on Ubuntu. I did have an issue with using F1 in the default xfce terminal application, it seems to grab the F1 to open the application help. For IF, I have aliases created that start an xterm window with a lager font size and different color scheme, and the F1 key works fine there. I was using the F1 key because I really didn’t want the bottom shortcut line on the screen all the time.
I haven’t really played anything, just started zork1 and anchorhead to test both types of game files. Also the anchorhead was a gblorb file, so it handles that, which is good. I did notice that the first screen scrolls past, and you have to scroll back to see it, instead of giving me a [More] prompt, like I prefer.
It would be nice to have a single command line interpreter for Linux that handles different formats, so I hope you will continue this project. Thanks!