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环境
RedHat Linux 9 + VWWare 7.1.2 + Putty 0.62
问题
Linux更改用户密码
解决
方法一
1.如果你是以普通用户登录的话，修改自己的密码，使用passwd命令。会让你先输入自己的旧密码，再输入两遍新密码。
[www.@localhost root]$ passwd
Changing password for user wgb.
Changing password for wgb
(current) UNIX password:
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[www.@localhost root]$
[www.@localhost root]$ passwd wgb
passwd: Only root can specify a user name.
2.如果你是root用户登录的话，使用passwd root或者passwd，就可以修改root的密码。直接输入两遍新密码就可以了，不用输入旧密码。
[root@localhost root]# passwd
Changing password for user root.
New password:
BAD PASSWORD: it is too short
Retype new password:
passwd: all authentication tokens updated successfully.
[root@localhost root]#
[root@localhost root]# passwd root
Changing password for user root.
New password:
BAD PASSWORD: it is too short
Retype new password:
passwd: all authentication tokens updated successfully.
[root@localhost root]#
方法二
root用户登录，打开终端，执行 echo "你想设置的密码" | passwd --stdin 用户名
[root@localhost root]# echo "wgb" | passwd --stdin wgb
Changing password for user wgb.
passwd: all authentication tokens updated successfully. 
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