传入一个网段地址，自动找出本网段内存活的IP地址。2，将存活的IP地址当作密码来创建Linux用户，用户名格式为：你的名字_数字 3，有几个存活IP地址，就自动创建几个用户 4，最后将创建的用户名和密码写入到/tmp目录下的某文件里
（1）找存活的ip
（2）将ip去除“.”，生成密码，
（3）创建用户，密码
（4）写入Path路径下的文件里（设置两个变量）
#!/bin/bash
Path=/tmp
for ip in 192.168.214.{1..5}
do
ping -c 1 $ip >/dev/null
if [ $? -eq 0 ];then
echo "$ip"
let i++
user=daisy_$i
useradd $user >/dev/null
(1) Passwd=`echo $ip | sed -r 's#[^0-9]##g'`
[ -d $Path ] || mkdir $Path
(2) echo $Pas swd | passwd -- stdin $user
echo "$user:$Passwd">>$Path/user_passwd
fi
done
用户登录验证程序
1、脚本里设置两个用户名和密码
2、让用户从屏幕输入账户和密码进行登录
3,、如果账户输入错误，让该用户继续输入账户，也可以注册用户
4、账户正确，输入密码
5、密码正确，登陆成功
6、同一个账号，密码最多允许输错3次，达3次，账号锁定（此时脚本不能退出）。
7、锁定账号以后，可以继续登录未锁定账号，也可以删除用户
#!/bin/bash
function login(){
USER1="daisy"
PASSWD1="123123"
USER2="helen"
PASSWD2="123456"
lock=""
Path=/tmp
useradd daisy
useradd helen
echo $PASSWD1 | passwd --stdin daisy
echo $PASSWD2 | passwd --stdin helen
while :
do
read -p "please write your username:" user
clear
echo "$lock" | grep -w "$user" &>/dev/null
if [ $? -eq 0 ];then
echo "locked"
continue
fi
if [ $user != "daisy" -a $user != "helen" ];then
echo "invaild username "
read -p "create username or not (choice yes or no):" create
case $create in
yes)
useradd $user
echo "create successfully"
passwd $user
[ $? -eq 0 ] && echo "create successfully"
echo "$user:$passwd" >> $Path/user_passwd
echo "transfer successfully"
exit
;;
no)
continue
;;
*)
echo "invaild number"
;;
esac
else
i=0
while :
do
read -p "please write your password:" passwd
clear
if [ $passwd == $PASSWD1 -a $user == "daisy" ];then
echo "login successfully"
exit
elif [ $passwd == $PASSWD2 -a $user == "helen" ];then
echo "login successfully"
exit
else
let i++
if [ $i -eq 3 ];then
echo "username has locked, please use another unlocked username"
sleep 1
clear
lock=$lock" $user"
sleep 1
read -p "delete username or not(choice yes or no):" delete
case $delete in
yes)
userdel $user
echo "delete successfully"
exit
;;
no)
exit
;;
*)
echo "invaild number"
;;
esac
break
fi
echo "password is wrong"
sleep 1
clear
fi
done
fi
done
}
function test(){
echo "123"
}
function title (){
cat <<FOF
********************
1、登录
2、退出
********************
FOF
}
while :
do
clear
title
read -p "请输入你的选择：" num
clear
case $num in
1)
login
;;
2)
echo "exit"
exit
;;
*)
echo "invaild number"
;;
esac
sleep 2
done