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Special Forums Hardware Filesystems, Disks and Memory Help please...random() in kernel? and Links? Post 81022 by vertigo23 on Monday 15th of August 2005 02:16:50 PM
Old 08-15-2005
Hard links

Quote:
Originally Posted by allomeen

2.Symbolic links in Linux and Unix can cross partition boundaries, but hard links cannot. Can somebody explain this to me?

Thank you
A hard link creates a new filesystem entry pointing to the data of the linked file - thus, it's more like a copy than a link, except that both files share the same data. With a hard link, if you delete the original, the linked file will still exist with all the original data, because it's not a special type of file, it's a filesystem entry pointing to the original data. Does that make sense? That's why you can't make a hard link across filesystems - the data being linked doesn't exist on the other filesystem.
 

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ln(1)							      General Commands Manual							     ln(1)

Name
       ln - link to a file

Syntax
       ln [ -f ] [ -i ] [ -s ] name1 [name2]
       ln [ -f ] [ -i ] [ -s ] name ... directory

Description
       A  link is a directory entry referring to a file.  A file, together with its size and all its protection information may have several links
       to it.  There are two kinds of links: hard links and symbolic links.

       By default makes hard links.  A hard link to a file is indistinguishable from the original directory entry.  Any  changes  to  a  file  are
       effective independent of the name used to reference the file.  Hard links may not span file systems and may not refer to directories.

       Given  one or two arguments, creates a link to an existing file name1.  If name2 is given, the link has that name.  The name2 may also be a
       directory in which to place the link.  Otherwise it is placed in the current directory.	If only the directory is specified,  the  link	is
       made to the last component of name1.

       Given  more  than two arguments, makes links to all the named files in the named directory.  The links made have the same name as the files
       being linked to.

Options
       -f   Forces existing destination pathnames to be removed before linking without prompting for confirmation.

       -i   Write a prompt to standard output requesting information for each link that would overwrite an existing file.  If  the  response  from
	    standard input is affirmative, and if permissions allow, the link is done. The -i option has this effect even if the standard input is
	    not a terminal.

       -s   Creates a symbolic link.

	    A symbolic link contains the name of the file to which it is linked.  The referenced file is used when an operation  is  performed	on
	    the  link.	 A  on a symbolic link returns the linked-to file.  An must be done to obtain information about the link.  The call may be
	    used to read the contents of a symbolic link.  Symbolic links may span file systems and may refer to directories.

See Also
       cp(1), mv(1), rm(1), link(2), readlink(2), stat(2), symlink(2)

																	     ln(1)
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