CosmOS
> it says: it worked
finished
> the last program left 0, which is: it did what it was asked
finished
> type: give me a file name
finished
> the last program left 2, which is: it was asked wrongly
finished
> type: cannot find the file, error 2
finished
> the last program left 1, which is: it did not
finished
> halted
Execution halted.
[exit 0]