Linux：password already has been used!
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问题描述，将某用户密码更改为之前使用过的密码，提示此错误
1. /etc/pam.d/common-password,此文件中的安全策略可以限制用户不能更改为之前使用的历史密码
password required pam_pwhistory.so use_authtok remember=6 retry=3
2. Linux历史密码在/etc/security/opasswd中存放
3. 解决方法
a. 临时更改commen-password文件修改密码修改策略，去除历史密码的限制，更改完密码后在恢复原来的策略
b. 删掉/etc/security/opasswd中关于被修改文件的内容，这样就检测不到之前的历史密码了
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