批量扫描某个网段中的主机（并发）

创建目录编写脚本文件

mkdir /root/ip_scan_shell/
touch  /root/ip_scan_shell/online_server.txt
touch  /root/ip_scan_shell/offline_server.txt
touch  /root/ip_scan_shell/ip_scan.sh

写入下面shell到脚本文件中

#!/bin/bash
#!/bin/bash

#每次执行脚本时清理上一次运行的主机记录
> /root/ip_scan_shell/online_server.txt
> /root/ip_scan_shell/offline_server.txt

ip="192.168.100."

for host_number in {1..254}
do
    ( if ping ${ip}${host_number} -c 1 -w 1 &> /dev/null;then 
    echo "${ip}${host_number} server is online" | tee -a /root/ip_scan_shell/online_server.txt
    else
    echo "${ip}${host_number} server is offline" | tee -a /root/ip_scan_shell/offline_server.txt
    fi ) &
done
wait

运行示例