filter read mails

Hi all:

I have a little shell script that gives me a list of From: and Subject:
headers of my inbox file. The only line I use for this is:

formail +1 -z -cx From: -cx Subject: -s sed '1,1s/["\\]//g; 2,2s/^/-> /; $G' < 
/var/mail/claus

Works just fine.

However, I want to filter those mails and have only read mail appearing
in that list. The regexp would look like this:

        ^Status:.*R

How can I tell my above mentioned script to skip all mail that have a
"Status: R" line?

Any idea?

Claus

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