Getting a text file rid of all superfluous blank lines

[Guy Fraser]

On Wed, 2005-30-11 at 23:44 +0800, John Summerfied wrote:
> Paul Smith wrote:
> > Dear All
> > 
> > Taking a text file, how can one eliminate at once all superfluous blank lines?
> > 
> > Thanks in advance,
> > 
> > Paul
> > 
> man cat
> man grep
> 
> 
> -- 
> 
> Cheers
> John
> 
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> 
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sed -e 's;^\w*$;;' file-to-clean | grep -v '^$'