每5分钟检查一次连接并将结果写入LINUX中的文件（无ping）的脚本

Question

I need to check my connection to a spesific port every 5 minutes, currently i can't use ping command, so i need other alternative to do this.I want to execute this command in shell script

Can someone help me to show some example for this case?

Answer 1

port=80
ip=8.8.8.8
checkIntervalSecs=5
timeoutSecs=1
while true ; do
    if $(nc -z -v -w$timeoutSecs $ip $port &>/dev/null); then
         echo "Server is up!"
    else
         echo "Server is down!"
    fi
    sleep $checkIntervalSecs
done

This runs until you kill it. For an explanation of the nc command, it is basically taken from SO question @IporSircer suggested .