[root@dave ~]# useradd good 建立用户good [root@dave ~]# passwd good 位用户good建立密码 Changing password for user good. New UNIX password: 输入密码(密码不会显示) BAD PASSWORD: it is based on a dictionary word(警告root密码过于简单,普通用户会被拒绝修改) Retype new UNIX password: 确认密码(密码不会显示) passwd: all authentication tokens 0updated successfully.密码修改成功 [root@dave ~]#