Shell脚本配置静态IP之RedHat7

#提取IP地址和网关
IP=`ip addr |awk '/inet /' |sed -n '2p' |awk -F' ' '{print $2}' |awk -F'/' '{print $1}'`
#MASK=`ifconfig |grep 'inet '|grep -v '127.0.0.1'|awk '{print $4}'`
GATEWAY=`route -n |sed -n '3p'|awk '{print $2}'`
INNETO=`ip addr  | awk  -F '^2:' '{print $2}' |awk  -F ':' '{print $1}'  | awk NF|awk '{sub("^ *","");sub(" *$","");print}'  |sed -n 1p`    
INNETW=`ip addr  | awk  -F '^3:' '{print $2}' |awk  -F ':' '{print $1}'  | awk NF|awk '{sub("^ *","");sub(" *$","");print}'  |sed -n 1p`
local eth_conf=/etc/sysconfig/network-scripts/ifcfg-${INNETO}
if grep "dhcp" ${eth_conf} &>/dev/null;then
    [ ! -f ${eth_conf}.bak ] && cp ${eth_conf}{,.bak}        
    sed -i '/BOOTPROTO/ s/dhcp/static/' ${eth_conf}
    sed -i "/BOOTPROTO/a GATEWAY=${GATEWAY}" ${eth_conf}
    sed -i "/BOOTPROTO/a NETMASK=255.255.255.0" ${eth_conf}
    sed -i "/BOOTPROTO/a IPADDR=${IP}" ${eth_conf}
    local boot_value=$(grep '^ONBOOT' ${eth_conf} |awk -F'"' '{print $2}')
    if [ ${boot_value} != "yes" ];then
        sed -i '/ONBOOT/s /no/yes/' ${eth_conf}
    fi
else
  echo "already config static IP"
fi