Getting a text file rid of all superfluous blank lines

[Paul Smith]

On 11/30/05, Paul Howarth <paul at city-fan.org> wrote:
> > Taking a text file, how can one eliminate at once all superfluous blank lines?
>
> What is your definition of a "superfluous blank line"? Is that all blank
> lines, or all consecutive blank lines where the number is more than one?
>
> If it's the latter, you may find "more -s filename" to your liking.

Thanks, Paul. I mean "all consecutive blank lines where the number is
more than one". Furthermore, I mean how to delete those blank lines
from the file.

Paul