利用shell实现批量添加用户

时间：2022-04-11 07:40:18

批量添加用户并设置随机密码，把添加的用户的名字和密码保存到文件中。

[root@lamp scripts]# cat user.sh

#!/bin/sh

for i in `seq -w `

do

  pass=$(echo "`date`$RANDOM"|md5sum|cut -c -)         //取随机数的方法是date结果和random随机数拼接并计算md5值取前8位

  useradd kg$i

  echo "$pass"|passwd --stdin kg$i

  echo -e "kg$i\t$pass">>/tmp/pass.txt

done

[root@lamp scripts]# seq -w 

[root@lamp scripts]# sh user.sh

Changing password for user kg01.

passwd: all authentication tokens updated successfully.

Changing password for user kg02.

passwd: all authentication tokens updated successfully.

Changing password for user kg03.

passwd: all authentication tokens updated successfully.

Changing password for user kg04.

passwd: all authentication tokens updated successfully.

Changing password for user kg05.

passwd: all authentication tokens updated successfully.

Changing password for user kg06.

passwd: all authentication tokens updated successfully.

Changing password for user kg07.

passwd: all authentication tokens updated successfully.

Changing password for user kg08.

passwd: all authentication tokens updated successfully.

Changing password for user kg09.

passwd: all authentication tokens updated successfully.

Changing password for user kg10.

passwd: all authentication tokens updated successfully.

[root@lamp scripts]# cat /tmp/pass.txt

kg01    3577b000

kg02    3ddefcfe

kg03    c1ec8c1e

kg04    0bdcdafc

kg05    f172c380

kg06

kg07    fbe82aeb

kg08    cad21c1c

kg09    5f7cdc56

kg10    b60958ad

[root@lamp scripts]# tail - /etc/passwd

kg01:x::::/home/kg01:/bin/bash

kg02:x::::/home/kg02:/bin/bash

kg03:x::::/home/kg03:/bin/bash

kg04:x::::/home/kg04:/bin/bash

kg05:x::::/home/kg05:/bin/bash

kg06:x::::/home/kg06:/bin/bash

kg07:x::::/home/kg07:/bin/bash

kg08:x::::/home/kg08:/bin/bash

kg09:x::::/home/kg09:/bin/bash

kg10:x::::/home/kg10:/bin/bash

[root@lamp scripts]#

linux中取随机数的几种方法：

[root@lamp scripts]# echo $RANDOM

[root@lamp scripts]# openssl rand -base64

C8ZBCmMhlKc=

[root@lamp scripts]# openssl rand -base64

BSaZWw8v

[root@lamp scripts]# openssl rand -base64

+S4K

[root@lamp scripts]# openssl rand -base64

daNeuw==

[root@lamp scripts]# date +%s%N

[root@lamp scripts]# date +%s%N

[root@lamp scripts]# date +%s%N

[root@lamp scripts]# head /dev/urandom|cksum

[root@lamp scripts]# head /dev/urandom|cksum

[root@lamp scripts]# head /dev/urandom|cksum

[root@lamp scripts]# cat /proc/sys/kernel/random/uuid

b8238fed-be13-47ac-8e30-b86ea0f822ff

[root@lamp scripts]# cat /proc/sys/kernel/random/uuid

0bb0cb5d-157e-45f9-889a-0d6a93d3d328

[root@lamp scripts]# cat /proc/sys/kernel/random/uuid

526c2cb3-a335--bf71-108e7517c4d9

[root@lamp scripts]#

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