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intlist=ifconfig |grep HWaddr
ELM=${#intlist[@]}

# select inet adapter
echo "Select your inet conn. [#]"
for ((i=0;i<$ELM;i++)); do
  echo $i. ${intlist[${i}]}
done
read item
int1=${intlist[${item}]}

#!/bin/bash

ifconfig -a |cut -f1 -d' '|grep  -v '^$' > /tmp/net.$$  # Put all inet names in a tmp file.

echo -n "Choose your device:"
read device

grep -q  "$device" /tmp/net.$$  #Test if there is such a device
test1=$?;

if [ $test1 -eq 0 ];then

ifconfig $device |grep -q HW # Test if this device has some Hardware address
test2=$?

if [ $test2 -eq 0 ];then
mac=`ifconfig $device |grep HW|cut -f2 -d'W'`         # Get the mac
echo "The mac address of the interface $device is $mac"
else
echo The device $device has no mac address
fi
else
echo "There is no such interface \"$device\"" >&2  #Send it to the error output
rm -f /tmp/net.$$                  # removes the file before exit
exit 1
fi
rm -f /tmp/net.$$                  # removes the file

intlist=ifconfig |grep HWaddr

intlist=`ifconfig |grep HWaddr`

intlist=$(ifconfig |grep HWaddr)

workstation:~ # ifconfig eth0 | grep HWaddr|awk {'print $5'}
00:0C:29:42:64:1E

ifconfig eth0 |grep -i hw | awk '{ print $7 }'

workstation:/home/fredrik # cat /etc/SuSE-release
openSUSE 11.2 (i586)
VERSION = 11.2
workstation:/home/fredrik # ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:42:64:1E