If this is set, even root cannot delete the file until the attribute is unset.

设置完成后，即使是root用户也不能删除文件，直到属性解除。

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Use the lsattr command to see whether the immutable flag (or any other attribute) is set for a file or directory.

使用lsattr命令查看文件或者目录是否设置了不可变标识(或者任何其他属性)。

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Depending on the value of the type attribute, the tag file executes different JSP fragments, which set the model property with the same name as the HTML element.

根据type属性的值的不同，标记文件执行不同的JSP代码片段，并设置与HTML元素同名的模型属性。

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