[Ubuntu-zh] 有个问题请教各位前辈

[Neo Ko]

对dir来说没有x是不可以知道打开dir，至于r我就不太清楚怎么说

在 2011年1月31日 上午12:28，forest chen <anyformail在gmail.com>写道：

> 2011/1/30 foolhunger <foolhunger在gmail.com>
>
> > 比如：在对一个有r权限没有x权限的dir进行ls
> > -l的时候，可以显示出dir里的文件名，但是相关属性都是？？？（本人用bash），个人的理解是没有x就不能访问inode，所以无法显示属性。
> >
>
> 关于这点,在网上查了一下,找到一个解释,与你说的吻合. 具体看下文解释.页面链接为
> http://content.hccfl.edu/pollock/aunix1/filepermissions.htm
>
> > Execute Permission for Directories
> >
> > The chdir() system call is one of many that requires execute permission
> on
> > a directory.  Of course a directory isn't really a program that you can
> run
> > even if it has execute permission.  The execute bit is reused rather than
> > waste space with additional permission bits.
> >
> > Besides controlling a user's ability to cd into some directory, the
> > execute permission is required on a directory to use the stat() system
> > call on files within that directory.  The stat() system called is used to
> > access the information in a file's inode, and must be done before you can
> > open or delete (via the unlink() system call) that file.  (See Note<
> http://content.hccfl.edu/pollock/aunix1/filepermissions.htm#>.)
> >
> >
> > Because of its role in file access the execute bit on a directory is
> > sometimes called *search* permission.  For example, to read a file
> foo/bar,
> > you must have read permission for the file itself, but before the file
> can
> > be accessed you must first search the directory foo for the inode of file
> > bar.  This requires search (x) permission on the directory foo.  (Note
> you
> > don't need read permission on the directory in this case!  You only need
> > read permission on a directory to list its contents.)
> >
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