修改密码:paswd
[root@qingwu ~]# passwd
Changing password for user root.
New password:
BAD PASSWORD: The password is shorter than 8 characters
Retype new password:
passwd: all authentication tokens updated successfully.
删除密码:passwd -d 用户名
[root@qingwu ~]# passwd -d 123
Removing password for user 123.
passwd: Success
由以下可知root然后修改密码可以任意长度,普通用户修改密码不可以,只有root用户可以删除密码;
[123@qingwu ~]$ passwd
Changing password for user 123.
New password:
BAD PASSWORD: The password is shorter than 8 characters
New password:
BAD PASSWORD: The password is shorter than 8 characters
[root@qingwu ~]# passwd
Changing password for user root.
New password:
BAD PASSWORD: The password is shorter than 8 rs
Retype new password:
passwd: all authentication tokens updated sucy.
[123@qingwu ~]$ passwd -d 123
Only root can do that.
只有root然后可以改其他人的密码;
[123@qingwu ~]$ passwd root
passwd: Only root can specify a user name.
[root@qingwu ~]# passwd 123
Changing password for user 123.
New password:
破解密码法一:
1)重启虚拟机 ,按e进入如下界面;
2)按向下箭头找到linux16行在其末尾加上 rd.break,按ctrl+x执行;
3)mount -o remount,rw /sysroot(以可读写的方式重新挂载/sysroot)回车;
4)chroot /sysroot;
5)passwd root;
6)输入新密码;
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7)确认密码;
8)touch /.autorelabel(创建一个隐藏标签文件);
9)exit;
10)exit。至此修改成功,可以用新密码登录。