Saving running network config to sysconfig

savenetconfig.sh

#!/bin/bash
# Hack to quickly save the running network config to sysconfig

DEV=eth0

IPDATA=`ip addr show dev $DEV | tr -s " " | grep -m 1 inet | cut -d " " -f 3`
IP=`echo $IPDATA | cut -d "/" -f 1`
NM=`echo $IPDATA | cut -d "/" -f 2`

MAC=`ip addr show dev $DEV | tr -s " " | grep 'link/ether' | cut -d " " -f 3`

GATEWAY=`ip r | grep default | cut -d " " -f 3`

HOSTNAME=`hostname`

cat <<EOF > /etc/sysconfig/network-scripts/ifcfg-$DEV
IPADDR=$IP
PREFIX=$NM
HWADDR=$MAC
ONBOOT=yes
BOOTPROTO=static
EOF

cat <<EOF > /etc/sysconfig/network
GATEWAY=$GATEWAY
HOSTNAME=$HOSTNAME
EOF