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https://www.gnu.org/software/coreutils/manual/coreutils.html#File-permissions
文件权限被包括在coreutils包中。
The file mode bits have two parts: the file permission bits, which control ordinary access to the file, and special mode bits, which affect only some files.
文件模式位有两部分:文件权限位,它控制着文件的普通访问,特殊模式位,它只影响一些文件。
限制删除标志(restricted deletion flag)也称为 sticky 标志
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原文地址:http://www.cnblogs.com/createyuan/p/4493837.html