利用shell实现批量添加用户

[root@lamp scripts]# cat user.sh
#!/bin/shfor 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]#

[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]#