linux系统网络状态查询

var=$(cat/sys/class/net/eth0/carrier)

var1="0"

SLEEPTIME=1

while :;do

var=$(cat/sys/class/net/eth0/carrier)

if [ "$var" == "1"];then

if [ "$var" != "$var1"];then

touch/tmp/netok 

echo "networkchange ok "

busybox udhcpc -s/etc/init.d/udhcpc.script &

fi

var1=$var

elif [ "$var" == "0"];then

var=$(cat/sys/class/net/wlan0/carrier)

if [ "$var" == "1"];then

if [ "$var" != "$var1"];then

echo "wifi change ok"

touch/tmp/netok 

busybox udhcpc -s/etc/init.d/udhcpc.script &

fi

elif [ "$var" == "0"];then

if [ -f"/tmp/netok" ]; then

echo "eth and wifi all NG "

rm -rf/tmp/netok 

fi

fi

var1=$var

fi

#echo "At `date +'%F %T'`"

sleep $SLEEPTIME

done

var=$(cat /sys/class/net/eth0/carrier)var1="0"SLEEPTIME=1while :;dovar=$(cat /sys/class/net/eth0/carrier)if [ "$var" == "1" ];thenif [ "$var" != "$var1" ];thentouch /tmp/netok echo "network change  ok "busybox udhcpc -s /etc/init.d/udhcpc.script &fivar1=$varelif [ "$var" == "0" ];thenvar=$(cat /sys/class/net/wlan0/carrier)if [ "$var" == "1" ];thenif [ "$var" != "$var1" ];thenecho "wifi change ok "touch /tmp/netok busybox udhcpc -s /etc/init.d/udhcpc.script &fielif [ "$var" == "0" ];then

if [  -f "/tmp/netok" ]; thenecho "eth and wifi all NG "rm -rf /tmp/netok fifivar1=$varfi

#echo "At `date +'%F %T'` "

sleep $SLEEPTIMEdone