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#!/bin/sh

IP="10.10.100.1"

kill_deamon() {

/etc/init.d/deamon stop

}

start_deamon(){

/etc/init.d/deamon start

}

check_ping() {

local total="0"

local i="0"

while [ $i -lt 10 ]; do

local line=""

#echo "ping $IP"

line=`ping $IP -c 1 -s 1 -W 1 | grep "100% packet loss" | wc -l`

if [ "${line}" != "0" ]; then

echo "ping failed!"

total=$((total+1))

else

echo "ping ok!"

total="0"

fi

i=$((i+1))

sleep 1

done

if [ $total -gt 5 ]; then

echo "check failed!"

return 1

else 

echo "check ok!"

return 0

fi

}

start(){

local rtl=""

while [ 1 ]; do

check_ping

rtl=$?

if [ "$rtl" != "0" ]; then

echo " restart deamon start "

kill_deamon

start_deamon

else

sleep 600;

fi

done

}

start

其它的也有这样的，如下，都是用一个循环去判断而已：

#!/bin/sh

 

line="0"

total="0"

dst=`uci get network.mesh.gateway`

 

while [ 1 ]; do

line=`ping $dst -c 1 -s 1 -W 1 | grep "100% packet loss" | wc -l`

if [ "${line}" != "0" ]; then

total=$((total+1))

else

total="0"

fi

 

if [ "${total}" == "5" ]; then

reboot -f

fi

 

sleep 12

done

另外一个：

#!/bin/bash

for siteip in $(seq 1 254)do

    site="192.168.1.${siteip}"

    ping -c1 -W1 ${site} &> /dev/null

    if [ "$?" == "0" ]; then

        echo "$site is UP"

    else

        echo "$site is DOWN"

    fi

done

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