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grpck
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===
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用于验证组文件的完整性
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## 说明
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**grpck命令** 用于验证组文件的完整性，在验证之前，需要先锁定（lock）组文件`/etc/group`和`/etc/shadow`。
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grpck命令检查数据是否正确存放，每条记录是否都包含足够的信息，是否有一个唯一的组名，是否包含正确的用户，是否正确设置了组的管理员等。grpck检查发现错误以后，在命令行提示用户是否删除错误的记录。如果用户没有明确回答删除记录，grpck终止运行。
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### 语法
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```
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grpck(选项)
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```
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```
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-r：只读模式；
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-s：排序组id。
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```
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### 实例
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对组账号和影子文件进行验证：
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```
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grpck //必须以管理员身份运行
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grpck /etc/group /etc/gshadow //后面两句一样，如果没有输出信息，则表示没有错误。
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```
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测试错误的实例：
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```
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**echo check_user:x: >> /etc/group //添加一行错误的格式数据
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cat /etc/group | grep check_user**
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check_user:x: //这儿GID字段为空，是错误的。
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**grpck /etc/group**
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invalid group file entry
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delete line 'check_user:x:'? y //提示是否删除
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grpck: the files have been updated //这时已经删除了错误的行，提示文件已经更新。
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**cat /etc/group | grep check_user //没有查到，已经删除了。**
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```
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