HardLinks and Softlinks Post: 302556440

Sponsored Content

Top Forums Shell Programming and Scripting HardLinks and Softlinks Post 302556440 by ahmad.diab on Sunday 18th of September 2011 02:17:00 PM

09-18-2011

Registered User

Code:

you can control the permission by using "chmod" command , to create a soft link use "ln -s" command

---------- Post updated at 21:17 ---------- Previous update was at 21:15 ----------

Code:

Creating Hard and Symbolic Links
To create a symbolic link or a hard link, you use the same command name, In, which has the following syntax:

In [-fns] <source> [<target>]


Hard link is the default output of the ln command-that is, if you issue the ln command without the - s option, a hard link will be created.
 

In this command, <source> is the original file and <target> is the link that will be created and linked to the <source>. The options for the command are listed here:

-f (force). Link the file without questioning the user.

-n. If the <target> is an existing file, do not overwrite the content of the file. The -f option overrides this option.

-s. Create a symbolic link. The default is a hard link.

The hard links and symbolic links are compared in Table 4-2 

Table 4-2: Comparison of hard and soft links  Characteristic
 Hard Link
 Soft Link
 
Existence of original file
 You cannot create a hard link to a file that does not exist.
 You can create a symbolic link to a file that does not exist.
 
File systems
 A hard link cannot span file systems-that is, the link and the file it points to have to be in the same file system.
 A soft link can span file systems.
 
Kind of original file
 A hard link can only point to a file that is not a directory.
 A soft link can point to a file or a directory.
 
I-node
 A hard link has the same inode number as the file it points to.
 A soft link has a different inode from the file it points to.

ahmad.diab

View Public Profile for ahmad.diab

Find all posts by ahmad.diab

6 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

search for hardlinks based on filename via find command

I am using command substitution into a find command in a script where I have built a menu to do a bunch of tasks within my unix account. When I choose the options for to find a file/files that have the same inode of the entered filename, ie hardlinks, nothing shows up. When I choose the appropiate...

2. UNIX for Dummies Questions & Answers

How to list hardlinks?

Q1: Let's say I create a hard-link bar.c in /tmp to a file foo.c which resides in /var/tmp. Is there a easy way to find out which file /tmp/bar.c hardlinks to (and vice-versa - i.e which files have got hard-linked from /var/tmp/foo.c) when one does not (and wants to) know the location of the other...

3. AIX

IHS 6.1 on AIX - problem with symlinks / symbolic links / softlinks

Hello, I got an IHS 6.1 installed and want to publish a directory with an index of files, directories and symlinks / symbolic links / soft links, last ones being created with the usual Unix command "ln -s .... ....". In httpd.conf I've tried following for that directory: Options Indexes...

4. UNIX for Dummies Questions & Answers

dump/restore of a fs with 100 of millions hardlinks

Hi :-) i have a dump of a backupdisk (~540GB / ext3). The Backups have some 100 millions of hardlinks (backups are created with storeBackup). The OS is linux. A restore of a directory ended after some days with the errormessage "no memory to extend symbol table" The restore of the complete...

5. UNIX for Dummies Questions & Answers

Create softlinks between 2 different hosts

Hi I want to create softlinks, my source files and folders are placed in one server(hostname: info-1) and i want to access those files from different host(hostname :info-2). file and folder names in info-1 host. file1 folder1 Thanks, Mallik.

6. Solaris

Will softlinks occupy space in Solaris10

I have a pen drive1 with UFS file system and it has 43G used. It has a hell lot of soft links to other files which are located in a second pen drive2. We partitioned the file system on sun sparc machine, such that / has around 150G space.Now when we are copying the files from pen drive 1 to / on...

LEARN ABOUT DEBIAN

goo::canvas::ellipsemodel

Goo::Canvas::EllipseModel(3pm)				User Contributed Perl Documentation			    Goo::Canvas::EllipseModel(3pm)

NAME

       Goo::Canvas::EllipseModel - wrapper for GooCanvasEllipseModel

HIERARCHY

	 Glib::Object
	 +----Goo::Canvas::ItemModelSimple
	      +----Goo::Canvas::EllipseModel

INTERFACES

	 Goo::Canvas::ItemModel

METHODS

   itemmodel = Goo::Canvas::EllipseModel->new ($parent, $center_x, $center_y, $radius_x, $radius_y, ...)
       o   $parent (Goo::Canvas::ItemModel)

       o   $center_x (double)

       o   $center_y (double)

       o   $radius_x (double)

       o   $radius_y (double)

       o   ... (list)

PROPERTIES

       'center-x' (double : default 0 : readable / writable)
	   The x coordinate of the center of the ellipse

       'center-y' (double : default 0 : readable / writable)
	   The y coordinate of the center of the ellipse

       'height' (double : default 0 : readable / writable)
	   The height of the ellipse

       'radius-x' (double : default 0 : readable / writable)
	   The horizontal radius of the ellipse

       'radius-y' (double : default 0 : readable / writable)
	   The vertical radius of the ellipse

       'width' (double : default 0 : readable / writable)
	   The width of the ellipse

       'x' (double : default 0 : readable / writable)
	   The x coordinate of the left side of the ellipse

       'y' (double : default 0 : readable / writable)
	   The y coordinate of the top of the ellipse

SEE ALSO

       Glib::Object, Goo::Canvas::ItemModelSimple

COPYRIGHT

       Copyright (C) 2011 Gtk2-Perl Team

perl v5.14.2							    2011-11-16					    Goo::Canvas::EllipseModel(3pm)