[rustybox] invalid command

[mihaicostin34]

I keep having this problem. I have tried to return -1 in the main function as an Err(255) and with process::exit(255), yet they don't seem to work. Is there another way to return -1?

[alexandruradovici]

You have to return -1, not 255. The data type should be i32. Take a look at https://doc.rust-lang.org/std/process/fn.exit.html.