Linux 检测服务器是否连接着网络

 #!/bin/bash# 检测服务器是否连接着网络,如果网络不通 则 3次后 关机# crontab -e# */5 * * * * ./check.shecho "Starting test network was clear..."if test -e ./checkInfo then echo "CheckInfo File Exist..."else cat /dev/null > ./checkInfofilast_res=`head -1 ./checkInfo`checkInternet(){ ping_res=1 for url in "8.8.8.8" "61.139.2.69" "114.114.114.114" "168.95.1.1" "223.5.5.5" "180.76.76.76" do echo "PING ${url}" ping=`ping -c 3 ${url}|awk 'NR==7 {print $4}'` if [ ${ping} -eq 0 ]  then  ping_res=1  else  ping_res=2 fi if [ ${ping_res} -eq 2 ]  then  break fi done return ${ping_res}}checkInternetresult="$?"if [ ${result} -eq 1 ] then if [ "${last_res}" = "1" ]  then  echo "2" > ./checkInfo elif [ "${last_res}" = "2" ]  then  cat /dev/null > ./checkInfo  init 0  else  echo "1" > ./checkInfo fi else cat /dev/null > ./checkInfofi