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pwconv
===
用来开启用户的投影密码
## 补充说明
**pwconv命令** 用来开启用户的投影密码。Linux系统里的用户和群组密码分别存放在名称为passwd和group的文件中 这两个文件位于`/etc`目录下。因系统运作所需,任何人都得以读取它们,造成安全上的破绽。投影密码将文件内的密码改存在`/etc`目录下的shadow和gshadow文件内只允许系统管理者读取同时把原密码置换为"x"字符,有效的强化了系统的安全性。
### 语法
```
pwconv
```
### 实例
```
cat /etc/passwd | grep test
test:x:3001:3001::/home/test:/bin/sh
```
此时可以发现密码段是x
```
cat /etc/shadow | grep test
test:$6$nYOEWamm$bz07nlv/.RgJufb3FAqJJeULfwybzgxmrWqbk7O4vI0KsT6N.ujrh6dDIUcAJdfjksyuyAFDPIngZeD3cgcf.0:15022:0:99999:7:::
```
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