cat /proc/net/dev | 
grep : | sed -e 's/:/ /' | 
awk '{print $1 ":" $2 ":" $4 ":" $10 ":" $12}'

출력예:
lo:107048245:0:107048245:0
eth0:58831705:0:8582114:0
eth1:210167298:0:17851828:0

ifconfig eth0 | grep HWaddr | cut -dH -f2 | cut -d" " -f2

출력예:
xx:xx:xx:xx:xx

find . -nouser -exec chown username {} \;
find . -nogroup -exec chgrp groupname {} \;
find . -type f -exec chown username {} \;
find . -type d -exec chown groupname {} \;
find . -nouser -o -nogroup -exec chown username.groupname {} \;