linux系统批量创建用户和生成8位随机密码

1.1    脚本案例

批量创建20个用户，用户名为user1-user20,并生成8位随机登录密码，用户组采用键盘输入的方式，并将用户名及登录密码保存到/tmp/create_user.txt普通文件中。

1.2    脚本名称

create_user.sh

1.3    脚本代码

#!/bin/bash
read -p "Please input your user_group:" group_name
groupadd $group_name
for user in `echo user{1..20}`;
do
useradd -g $group_name $user
pass=$((RANDOM+10000000))
echo "$pass" | passwd --stdin $user > /dev/null 2>&1 && history -c
echo -e "$user 	 $pass 	 $group_name" > /tmp/create_user.txt
done

1.4    脚本运行方法

#执行创建用户脚本
[root@localhost ~]# /bin/sh /tmp/create_user.sh                              
Please input your user_group:kaifa
#验证用户和组是否创建成功
[root@localhost ~]# grep "^user*" /etc/passwd    
user1:x:1037:1037::/home/user1:/bin/bash
user2:x:1038:1037::/home/user2:/bin/bash
user3:x:1039:1037::/home/user3:/bin/bash
user4:x:1040:1037::/home/user4:/bin/bash
user5:x:1041:1037::/home/user5:/bin/bash
user6:x:1042:1037::/home/user6:/bin/bash
user7:x:1043:1037::/home/user7:/bin/bash
user8:x:1044:1037::/home/user8:/bin/bash
user9:x:1045:1037::/home/user9:/bin/bash
user10:x:1046:1037::/home/user10:/bin/bash
user11:x:1047:1037::/home/user11:/bin/bash
user12:x:1048:1037::/home/user12:/bin/bash
user13:x:1049:1037::/home/user13:/bin/bash
user14:x:1050:1037::/home/user14:/bin/bash
user15:x:1051:1037::/home/user15:/bin/bash
user16:x:1052:1037::/home/user16:/bin/bash
user17:x:1053:1037::/home/user17:/bin/bash
user18:x:1054:1037::/home/user18:/bin/bash
user19:x:1055:1037::/home/user19:/bin/bash
user20:x:1056:1037::/home/user20:/bin/bash
[root@localhost ~]# grep "kaifa" /etc/group      
kaifa:x:1037:
#查看创建的用户及对应用户的8位随机密码
[root@localhost ~]# cat /tmp/create_user.txt 
user1    10020135        kaifa
user2    10018434        kaifa
user3    10004073        kaifa
user4    10018115        kaifa
user5    10016417        kaifa
user6    10030208        kaifa
user7    10018870        kaifa
user8    10030613        kaifa
user9    10011175        kaifa
user10   10017527        kaifa
user11   10021220        kaifa
user12   10007388        kaifa
user13   10020800        kaifa
user14   10002884        kaifa
user15   10028439        kaifa
user16   10010083        kaifa
user17   10008170        kaifa
user18   10002190        kaifa
user19   10030764        kaifa
user20   10014551        kaifa

1.5    附录

1.5.1    批量删除用户和组命令：

[root@localhost ~]# for user in `echo user{1..20}`;do userdel -r $user; done
[root@localhost ~]# groupdel kaifa