问如何在一个文件中平平多个IP，并使用shell脚本只在另一个文件中打印在线IP？

EN

1. File full of IP's
[root@localhost scripts]# cat iplist.txt
172.31.57.63
localhost
127.0.0.1
172.31.57.62

2. Create the script

 [root@localhost scripts]# cat pingips.sh
 #!/bin/bash

 up_ipfile='online_server.txt'

 while IFS= read -r ips; do
        ping -c 1 $ips > /dev/null 2>&1
        if [ $? -eq 0 ]; then
              echo $ips >> $up_ipfile
        fi
 done < iplist.txt

 3. Run the script after making it executable 
 [root@localhost scripts]# ./pingips.sh


 4. It will create a file with IP's which are alive
 [root@localhost scripts]# cat online_server.txt
 172.31.57.63
 localhost
 127.0.0.1