#useradd [用户名]
#password [用户名]
example:
[root@www.linuxidc.com root]# useradd student
[root@www.linuxidc.com root]# passwd student
Changing password for user student
New password: (无回显)
Retype new password: (无回显)
passwd: all authentication tokens updated successfully
[root@www.linuxidc.com root]#