#本人新手写的不好之处，一定要指点我。我会不定期更新这个内容。

1、输入IP地址查找/etc/hosts文件中指定的域名

#!/bin/sh
#authorvperson
#qq737304790
#EnterthespecifiedIPtofindthecorrespondingdomainnameinthehostsfile

flag=0

if[$#-ne1]
	then
	echo"Inputerror"
	echo"Usage:$0127.0.0.1"
	exit1
fi

exec</etc/hosts

whilereadline
do
	if["$1"="`echo$line|awk'{print$1}'`"]
		then
			flag=1
			printf"Successfullyfindthedomainname!\n"
			echo-e"\033[31m$1==>>`echo$line|awk'{print$2}'`\033[0m"
			break
	fi
done

[${flag}-eq0]&&echo"NospecifiedIP"