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Top Forums UNIX for Dummies Questions & Answers need some info about symbolic link and hard link Post 302156443 by frank_rizzo on Tuesday 8th of January 2008 06:26:58 AM
Old 01-08-2008
Quote:
Originally Posted by detective linux
i open terminal and join as root
and i wrote ln -s blah blah
then i wrote ls
i see red file called blah blah
but didn't understand what is this can some one explain and is this the way to read it ?
This should fail if blah already exists. If blah is a directory it will create the link in the directory.

Quote:
Originally Posted by detective linux
what if remove the orginal file of hard link can i still see the content of the file
if its the last reference to the file then the file will be removed.

Quote:
Originally Posted by detective linux
and can i try to make a hard link to a directory ? To a non-existent file
no

Quote:
Originally Posted by detective linux
another more questions hope not one get angry coze i ask much

what if i try to change the permissions of the original file with chmod, or update its modification time with touch is there is something gunna happen for the links
the links all point to the same file so updating the permissions will appear like all links were changed. you cannot however change the permissions of a symbolic link.
 

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LN(1)							      General Commands Manual							     LN(1)

NAME
ln - make links SYNOPSIS
ln [ -s ] sourcename [ targetname ] ln [ -s ] sourcename1 sourcename2 [ sourcename3 ... ] targetdirectory DESCRIPTION
A link is a directory entry referring to a file; the same file (together with its size, all its protection information, etc.) may have several links to it. There are two kinds of links: hard links and symbolic links. By default ln 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. The -s option causes ln to create symbolic links. A symbolic link contains the name of the file to which it is linked. The referenced file is used when an open(2) operation is performed on the link. A stat(2) on a symbolic link will return the linked-to file; an lstat(2) must be done to obtain information about the link. The readlink(2) call may be used to read the contents of a symbolic link. Symbolic links may span file systems and may refer to directories. Given one or two arguments, ln creates a link to an existing file sourcename. If targetname is given, the link has that name; targetname 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 will be made to the last component of sourcename. Given more than two arguments, ln makes links in targetdirectory to all the named source files. The links made will have the same name as the files being linked to. SEE ALSO
rm(1), cp(1), mv(1), link(2), readlink(2), stat(2), symlink(2) 4th Berkeley Distribution April 10, 1986 LN(1)
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