Bashscripts.org

#!/bin/bash
echo -e "Interface\tMAC Address\t\tIP Address\tSpeed\t\tLink"

for x in `/sbin/ifconfig | grep Link | awk '{print $1}' | sort | egrep -v 'inet6|lo'`
do

        MAC=$(/sbin/ifconfig $x | grep "Link" | egrep -v inet6\|lo | awk '{print $5}')
        IP=$(/sbin/ifconfig $x | grep "inet addr" | cut -d: -f2 | cut -d' ' -f1)
        SPEED=$(/sbin/ethtool $x 2>/dev/null | grep "Speed" | cut -d: -f2 | sed 's/^[ \t]*//')
        LINK=$(/sbin/ethtool $x 2>/dev/null | grep "Link detected" | cut -d: -f2 | sed 's/^[ \t]*//')

        echo -e $x"\t\t"$MAC"\t"$IP"\t"$SPEED"\t"$LINK

done

echo -e "\n"

exit 0