Hi Paul, 

Before you spend any money, I might recommend the WikiBook on the topic. WikiBooks are freely available resources on many topics. Here's a link to the Sed WikiBook:  http://en.m.wikibooks.org/wiki/Sed

In addition, I've found this resource to be useful in learning Sed: http://www.grymoire.com/Unix/Sed.html

It's not a book exactly, but it has helped me locate a number of useful examples that allowed me to better explore the tool.

If you're looking for something more, the O'Reilly Guide to Awk and Sed seems to be well-reviewed, and may available at a bookseller near you.

Best of luck, 

Brandon

> On Jan 2, 2015, at 11:07 PM, paul g <pj.world at hotmail.com> wrote:
> 
> I would like to purchase the best book about 'sed' that I can buy could anyone please recommend this?
> 
> Thank you 
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