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hard link One of several directory entries which refer to the same Unix file. A hard link is created with the "ln" (link) command: ln
where and are pathnames within the same file system. Hard links to the same file are indistinguishable from each other except that they have different pathnames. They all refer to the same inode and the inode contains all the information about a file. The standard ln command does not usually allow you to create a hard link to a directory, chiefly because the standard {rm} and {rmdir} commands do not allow you to delete such a link. Some systems provide link and {unlink} commands which give direct access to the system calls of the same name, for which no such restrictions apply. Normally all hard links to a file must be in the same file system because a directory entry just relates a pathname to an inode within the same file system. The only exception is a {mount po
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