Author: Stan Eisenstat
Subject: Re: [Cs323] (no subject)
Date: Sunday, 18 Oct 2020, 20:29:07

    > Message Posted By: Unknown
    >
    > [...@bumblebee hw3]$ /c/cs323/Hwk3/mcBash $1
    > (1)$ $1
    > >>
    > Could you explain the output?

As you can verify by running the command

  % echo $1

the argument passed to mcBash is the empty string.
When you replace "$1" by "", you can an empty line.

--Stan-