In a text file: how do I tell the EOF, from a blank line?

[walterbyrd]

On May 16, 10:12 pm, Grant Edwards <gra... at visi.com> wrote:
> On 2007-05-17, walterbyrd <walterb... at iname.com> wrote:
>

> This has already been explained to you by at least 5 different
> people -- complete with examples.


Sorry about dual posting. I am using google groups. Usually, after I
submit a message, I can find that message after a few minutes. This
time, I could not find the messages that I posted after waiting for
hours. I figured something must have gone wrong, so I re-posted.