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From: Patrick Hess <patrickhess@gmx.net>
To: freebsd-questions@freebsd.org
Subject: Re: Script question
Date: Mon, 15 Jun 2015 02:27:35 +0200
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Polytropon wrote:
> Or if you want to omit the grep call:
> 
> awk '/spam=YES/ {print $11}' /var/log/maillog | sort | uniq | sed -e 's/^.*=//' > /tmp/spam-ip.txt
> 
> And then continue:
> 
> cat /tmp/spam-ip.txt >> /usr/samba/mail/envelope
> cat /tmp/spam-ip.txt | mail -s "SPAM IPs...." us.navy@outlook.com
> 
> Finally, you can easily remove /tmp/spam-ip.txt.

You could even take this one step further and eliminate the need for
a temporary file altogether by making use of tee(1):

    awk '/spam=YES/ {print $11}' /var/log/maillog |
    sort |
    uniq |
    sed -e 's/^.*=//' |
    tee -a /usr/samba/mail/envelope |
    mail -s "SPAM IPs...." us.navy@outlook.com

Patrick