Jean-Marc Lasgouttes wrote:
> Angus> That's equivalent to:
> 
> Angus> sed -n -e 's/a/b/p' -e 's/c/d/p' -e 's/e/f/p' "$file"
> 
> Angus> which prints out only those lines in "$file" that are
> Angus> manipulated.
> 
> How portable is -n?

It's portable. 

As in, it's not mentioned here:
http://www.student.northpark.edu/pemente/sed/sedfaq6.html#s6.6

-- 
Angus

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