Bash将IP范围分解为多个变量

Question

我正在尝试编写一个bash脚本，它将执行以下

读取存储有IP地址的文件ips.txt

获取这些IP地址并将其分解为3个变量，这些变量会写入自己的文件

Files
thrid_octave.txt
last_digit_third_octave.txt
last_octive.txt
Variables 
thrid_octave
last_digit_third_octave
last_octive
EX: 12.34.117.88
thrid_octave = 111
last_digit_third_octave = 7
last_octive = 88

以下是我打算如何使用这些变量

#!/bin/bash
domain="$(cat domains.txt)"
ip="$(cat ips.txt)"
last_number_third_octete="$(cat last_number_third_octete.txt)"
thrid_octive="$(cat thrid_octive.txt)"
last_octive="$(cat last_octive.txt)"
while read -r domain <&3 && read ip <&4 && read last_number_third_octete <&5 && read thrid_octive <&6 && read last_octive <&7 &&; 
do 
echo "processing $domain";

"##################################### $domain ######################################################"
smtp-listener $ipn
<virtual-mta $domain.c$last_number_third_octete.$last_octive>
smtp-source-host $ip mailer1-vmta-plat-$thrid_octive-$last_octive.$domain
</virtual-mta>
<virtual-mta-pool $domain.p>
virtual-mta $domain.c$thrid_octive-$last_octive
</virtual-mta-pool>
nn
done 3<domains.txt 4<ips.txt 5<last_number_third_octete.txt 6<thrid_octive.txt 7<last_octive.txt
echo "All Set"

Answer 1

您可以尝试使用cut，如下所示：

ip="12.34.117.88"
thrid_octave=`echo $ip | cut -d. -f3`
last_digit_third_octave=`echo $ip | cut -d. -f3 | cut -c 3`
last_octive=`echo $ip | cut -d. -f4`