I think this is not the use you intent

In *my* opinion:

On Thu, Feb 2, 2017 at 3:44 PM, dean <deangwillia...@gmail.com> wrote:

>    (setq Ln_no 0)
>    (in Epic_txt_fl_pth
>       (until (eof)
>          (setq Ln_no (inc 'Ln_no) )

this is redudant since you're simply incrementing the value of a global
symbol, simply write:   (inc 'Ln_no)

>          (prog....
> ‚Äč

As a general not too exact rule setq creates global value while let creates
a local value

More exactly setq (and set) binds a symbol to a value in the "global
context" while let binds a symbol to a value only inside the let expression

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