regenerate_hosts.sh

#!/bin/bash
BASE_MACS="6c:4b:90 a4:1f:72 78:45:c4 64:00:6a b0:83:fe d4:be:d9 00:23:24"
arg="c8:1f:66"
registry="/etc/registry/hosts"
cp -v $registry "$registry-$(date '+%Y%m%d_%H%M')"
for mac in $BASE_MACS
do
    arg="$arg\| $mac"
done
#echo grep "$arg" /var/lib/dhcp/dhcpd.leases
MACS=""
for line in $(grep "$arg" /var/lib/dhcp/dhcpd.leases | sort -u)
do
    if [ "$line" != "hardware" ] && [ "$line" != "ethernet" ]
    then
        mac=$(echo $line | sed 's/;$//g')
        if [ -z "$(grep $mac $registry)" ]
        then
            MACS="$MACS $mac"
        fi
    fi
done
for mac in $MACS
do
    echo "$(date '+%Y%m%d') $mac inconnuAutoGen" >> $registry
done
systemctl restart registry wakeonlan