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uname -a: Linux digifus 3.13.0-57-generic #95-Ubuntu SMP Fri Jun 19 09:28:15 UTC 2015 x86_64 

uid=33(www-data) gid=33(www-data) groups=33(www-data) 

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/usr/share/doc/ifupdown/examples/   drwxr-xr-x
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Viewing file:     get-mac-address.sh (382 B)      -rw-r--r--

#!/bin/sh

set -e

export LANG=C

iface="$1"
mac=$(/sbin/ifconfig "$iface" | sed -n -e '/^.*HWaddr \([:[:xdigit:]\-]*\).*/{s//\1/;y/ABCDEF/abcdef/;p;q;}')
which=""

while read testmac scheme; do
	if [ "$which" ]; then continue; fi
	if [ "$mac" = "$(echo "$testmac" | sed -e 'y/ABCDEF/abcdef/')" ]; then which="$scheme"; fi
done

if [ "$which" ]; then echo $which; exit 0; fi
exit 1