shell指令碼更新或者添加host

shell指令碼更新或者添加host 指令碼可以根據傳入的參數進行對 /etc/hosts 更改或者添加host 例如執行 sudo ./changeHost.sh blog.duplicatedcode.com 192.168.1.222 網域名稱是固定的,外網ip不斷變化 # !/bin/sh####################@in_url 輸入的url#@in_ip 輸入的ip##########################in_url=${1}in_ip=${2} #更改hostupdateHost(){# read   inner_host=`cat /etc/hosts | grep ${in_url} | awk '{print $1}'`  if [ ${inner_host} = ${in_ip} ];then     echo "${inner_host}  ${in_url} ok"  else    #替換     sed -i "s#${inner_host}#${in_ip}#g" /etc/hosts     if [ $? = 0 ];then       echo "change ${inner_host} to ${in_ip} ok"       else          inner_ip_map="${in_ip} ${in_url}"         echo ${inner_ip_map} >> /etc/hosts         if [ $? = 0 ]; then           echo "${inner_ip_map} to hosts success host is `cat /etc/hosts`"         fi     fi  fi} main(){   updateHost}main