Shell获取配置文件中一个字段的值

问题：系统的网络配置文件为/mnt/config/network.xml; 内容如下：

<?xml version="1.0" encoding="gb18030" standalone="no" ?>
<HHProtocol>
    <network>
        <state>2</state>
        <prevState>0</prevState>
        <dns1>223.5.5.5</dns1>
        <dns2>223.5.5.5</dns2>
        <ethIp>192.168.1.32</ethIp>
        <ethNetmask>255.255.255.0</ethNetmask>
        <ethGateway>192.168.1.1</ethGateway>
        <ethMac></ethMac>
        <WifiIp>192.168.1.101</WifiIp>
        <WifiNetmask>255.255.255.0</WifiNetmask>
        <WifiGateway>192.168.1.1</WifiGateway>
        <WifiMac></WifiMac>
        <WifiSsid>KYiHua</WifiSsid>
        <WifiPasswd>k6688</WifiPasswd>
    </network>
</HHProtocol>

如何获取<state>标签的值？
解决方法：

NETWORK_CFG_FILE="/mnt/config/network.xml"
if [ -f $NETWORK_CFG_FILE ]; then
        NETWORK_STATE=`sed -n 's/.*>\(.*\)<\/state>/\1/p' $NETWORK_CFG_FILE`
        echo $NETWORK_STATE
        if [ "$NETWORK_STATE" == "0" ]; then
                echo "wifi ap mode"
                insmod rtutil5370ap.ko
                insmod rt5370ap.ko
                insmod rtnet5370ap.ko
                ifconfig ra0 192.168.8.1
                /sbin/udhcpd -fS /etc/udhcpd.conf &
        elif [[ "$NETWORK_STATE" == "3" || "$NETWORK_STATE" == "4" ]]; then
                echo "wifi sta mode!"
                insmod rtutil5370sta.ko
                insmod rt5370sta.ko
                insmod rtnet5370sta.ko
                /usr/local/bin/wpa_supplicant -B -Dwext -ira0 -c/etc/wpa_supplic
                #ifconfig ra0 up
        else
                echo "ethernet mode"
                ifconfig eth0 up
        fi
else
        echo "network cfg xml not exist, ethernet mode"
        ifconfig eth0 up
fi