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#!/bin/sh
mac=$(ifconfig eth0|grep HWaddr|awk '{print $5}'| tr '[a-z]' '[A-Z]' |
+ cut -d ':' -f1-5)
...
macinc=$(echo "obase=16; $incout"|bc)
fi
echo "Mac address= $mac:$macinc"

Mac address= 00:19:D1:F6:F7:F1

Mac address= 00:19:D1:F6:F7:00