2011/1/30 foolhunger <foolhun...@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.) > -------------- 下一部分 -------------- 一个HTML附件被移除... URL: <https://lists.ubuntu.com/archives/ubuntu-zh/attachments/20110131/63cb7a75/attachment.html> -- ubuntu-zh mailing list ubuntu-zh@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-zh
