Константин

#!/bin/bash
cat /var/lib/dhcpd/dhcpd.leases | awk '/lease/ || /client-hostname/ || /hardware/ || /}/' | awk '!/uid/' | sed 's/lease/Client-IP /g' | sed 's/{//'g | sed 's/hardware ethernet/MAC /g' | sed 's/client-hostname/NAME /g' | sed 's/}/-----------------------------------------------------------/g' | sendmail mail@mail.com

Более-менее выход из решения:
-----------------------------------------------------------
Client-IP 192.168.1.1
MAC ff:ff:ff:ff:ff:ff;
NAME "PC-1";
-----------------------------------------------------------
Client-IP 192.168.1.1
MAC ff:ff:ff:ff:ff:ff;
NAME "PC-1";
-----------------------------------------------------------
Client-IP 192.168.1.1
MAC ff:ff:ff:ff:ff:ff;
-----------------------------------------------------------
Client-IP 192.168.1.1
MAC ff:ff:ff:ff:ff:ff;
NAME "PC-1";
-----------------------------------------------------------