shell-script（三）批量查询域名

知识点一：while–do–done 语句的运用

案例一：

知识点二：判断符号

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-eq           //等于 equal

-ne           //不等于 not equal

-gt            //大于 （greater ）

-lt            //小于  （less）

-ge            //大于等于 

-le            //小于等于

知识点三：数字的自增

var = $(($var + 1))

案例二：

扫描htb所有开放443端口的主机，查询到域名后，自动写入/etc/hosts

IP-out.txt is the list of IPs

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for line in $(cat IP-out.txt)
do
    nmap -p443 --open ${line} >> https
    #masscan -p443 -e tun0 $line --open #masscan扫描效果不佳
done
## scan open port ##

cat https | grep 10.10.10 > https_out
rm https
awk '{ print $5}' https_out > https
rm https_out
cat https | grep 10.10.10 > https_out #https_out file is important, it's contains all ips who opens 443 port
## clearing data ##

for IPs in $(cat https_out)
do
    sslyze --regular ${IPs} --xml_out=${IPs}
done
## get domain ##

for IPs in $(cat https)
do
    if ls /root/Desktop/$IPs/$IPs;then
         echo '-------------'
         mv $IPs /root/Desktop/$IPs
         cat /root/Desktop/$IPs/$IPs | grep "Common Name" > /root/Desktop/$IPs/domain
         Domain=`awk '{print $3}' /root/Desktop/$IPs/domain`
         echo $IPs $Domain >> /etc/hosts
    else
         echo 'not found'
    fi
done

cat /etc/hosts

/etc/hosts成功写入

但是运行展示效果不佳，以后学习如何写一个看起来整洁、美观、专业的shell script脚本。