How to combine lines of output, 3 at a time?

Hello.  This is on Linux.  I have a command that returns many

attributes for each set top box on a headend, but I only need the

MacAddr, HubId, and Model.

 

To get that info, I pipe the output to grep & sed like this to leave only
the text I care about:

output | egrep "Mac Address|Hub Id|Model" | sed "s/^.*[ ]//"

 

That gives me vertical output like below (many more lines than this):

00:12:34:56:78:9A

101

123456

00:21:CE:54:22:7A

101

876543

00:21:32:43:54:87

1

234

 

I would like to combine this output 3 lines at a time, like:

00:12:34:56:78:9A 101 123456

00:21:CE:54:22:7A 101 876543

00:21:32:43:54:87 1 234

 

Is there a way to do this using sed?

 

Thanks,

Dave

 

 



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