Author: Stan Eisenstat
Subject: Re: [Cs323] Note 4, first bullet point
Date: Wednesday, 14 Oct 2020, 18:14:54

    > Message Posted By: Unknown
    >
    > Says that "${ not followed by an alphanumeric or _" is an error. However,
    > isn't it also an error if immediately followed by a digit? (The staff
    > solution also seems to imply the latter).

No, as is illustrated by

  % /c/cs323/Hwk3/mcBash foo
  (1)$ ${1}
  >> foo

But if you omit the closing },

  % /c/cs323/Hwk3/mcBash foo
  (1)$ ${1
  Invalid expansion

--Stan-