在 Bash 中查找 IP 并写入文件

在 Bash 中查找 IP 并写入文件

我正在尝试反向查找主机名列表以找到它们的 IP 并写入文件。我指的是教程并对其进行扩展以使用主机名列表。我是 Bash 脚本新手,这是我想出的内容,但没有按预期打印,

for name in hostA.com hostB.com hostC.com;
do
    host $name | grep "has address" | sed 's/.*has address //' |
    awk '{print "allow\t\t" $1 ";" }' > ./allowedip.inc
done

答案1

使用dig

for host in hostA.com hostB.com hostC.com
do
    # get ips to host using dig
    ips=($(dig "$host" a +short | grep '^[.0-9]*$'))
    for ip in "${ips[@]}";
    do
        printf 'allow\t\t%s\n' "$ip"
    done
done > allowedip.inc

输出:

$ cat allowedip.inc
allow       64.22.213.2
allow       67.225.218.50
allow       66.45.246.141

循环遍历一个文件,每行一个主机:

while IFS= read -r host;
do
    # get ips to host using dig
    ips=($(dig "$host" a +short | grep '^[.0-9]*$'))
    for ip in "${ips[@]}";
    do
        printf 'allow\t\t%s\n' "$ip"
    done
done < many_hosts_file > allowedip.inc

答案2

grep 的示例:

$ host google.com|grep -oP "has address \K.*"                                                  
216.58.214.238

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