$ /sbin/ifconfig eth0 Link encap:Ethernet HWaddr 11:22:33:44:55:66 $ /sbin/ifconfig eth0|sed -n 's/^.*HWaddr \(.*\)$/\1/p' 11:22:33:44:55:66 # ifconfig eth0 down # ifconfig eth0 hw ether 11:22:33:44:55:66 # ifconfig eth0 up # vi /etc/netwo…