I have heard that creating hard link to a directory is not possible however when reading the man page of "ln" the "-d/-f" option says hard link directories ( super-user only). Thus this mean the super user i.e root can create hard link to directory and not a normal user , If yes then you . Even on specifying the above options I get a operation not permitted for a super user.
View 9 RepliesThere are basically two main limitations with hard links:
Hard links normally require that the link and the file reside in the same file system. Only the superuser can create a hard link to a directory.
Thus, symbolic links were introduced to get around the limitations of hard links. So, the question is, are hard links still needed? Might there be situation where they are more useful?
I am trying to use ln to create a hard link to file a and whenever I do it, it creates a copy of the file instead. After having edited file a, when opening the link, it shows the old information and opening file a shows the new information. The command I am using is
Code:
ln /home/user/file
within the new directory i am trying to link from. I am using centos 5.4.
CentOS 5.2 64bit 2.6.18-92.el5xen. Use rsync with --link-dest for nightly backups, works well. Was recently asked to start weekly backups to an external drive for off-site storage. The regular syncing works but hard linking seems to be ignored. So the backup is long with no space saving advantage. Here is an example of the command being run:
rsync --stats -axzvl --numeric-ids --delete --link-dest=/mnt/DISASTERBACKUPS/austinBackups/backups/2009-08-21 /AUSTINBACKUPS/backups/2009-08-24 /mnt/DISASTERBACKUPS/austinBackups/backups/
I have searched around and am trying to understand the difference between a hard link and symbolic link (soft link). I found this link is quite useful. But I am still not very clear. I understand soft link is not a copy of original file, but is a hard link a copy or not?
View 4 Replies View RelatedUbuntu 10.04 64-bit
Partition on HD
/root
/home
[code]....
I need to copy tables from abc5/abc5@pqrXYZ1 to jk8/jk8@pqrXYZ1. For this I am trying to create a link between the 2 databases but not wkng.I am pasting here what I ve tried.
sqlplus jk8/jk8@pqrXYZ1
[code]....
I've just installed Ubuntu 10.04, trying out linux for the first time. I'm wondering if it's possible to link my documents folder in Ubuntu to my documents folder in Windows, so that when I open the folder in Ubuntu, I am linked to the folder in Windows.
View 1 Replies View RelatedI have an external hard drive mounted at /media/exthdd/ On that hard drive I have folders: Music, Pictures, Videos, etc. Can I make symbolic links to /media/exthdd/Music/ to say the root directory /_ ? the directory /_ is empty I just want a quick method of typing to get me there much like [cd ~] gets me to my home/username folder. I have my music organized by Artist/Year-Album/Track.Title.mp3 I want to be able to "cd /_" then "ls" and see all Artist folders.
View 9 Replies View RelatedIn the ordering of files I keep I need links to directories. Sometimes I even need to move directories to new locations. I have tried using symlinks, but they become dead when I move the directory they point to. I have tried hard links, but I haven't found any Linux file system that would support hard linked directories. How can I achieve that a complex structure of directories (currently with symlinks for directories and hard links for files) keep symlinks live when directories are moved?
- is there any utility that updates symlinks when a directory is moved?
- is there any Linux filesystem that supports hard linked directories?
- is there any good Linux interface to the new NTFS (the only file system I know to support automatically updating directory links, called directory junctions)?
how can we create soft link and hard link in RHEL5 when am using in command it is giving format error
View 6 Replies View RelatedWe have two directories:
$ ls -l
total 8
drwxr-x--- 2 nimmy nimmy 4096 Nov 15 19:42 jeter
drwxr-x--- 2 nimmy nimmy 4096 Nov 15 19:42 mariano
I create one file in the first folder:
$ dd if=/dev/zero of=jeter/zero_file.1 bs=512000 count=1
1+0 records in
1+0 records out
512000 bytes (512 kB) copied, 0.268523 s, 1.9 MB/s
This is the output of du:
$ du -sh *
504K jeter
4.0K mariano
As expected, if I place a hard link of the zero_file. in the other folder du output does not change:
$ ln jeter/zero_file.1 mariano/zero_file.2
$ du -sh *
504K jeter
4.0K mariano
there is nothing in the filesystem that points to zero_file.1 as the original file. So how does du know to count zero_file.1 but not zero_file.2?It cannot be a timestamp comparison because all hard links share one inode; they'll have the same timestamp data correct?
There are two directories A and B and a file F which is located in B. The working directory is B.How can you create a symbolic link in A pointing to F in B without changing the directory?
View 2 Replies View Relatedi am a oracle DBAI want to crete a link for a directory in production serverto remote host.
View 6 Replies View RelatedThere are two directories A and B and a file F which is located in B. The working directory is B.How can you create a symbolic link in A pointing to F in B without changing the directory?
View 8 Replies View RelatedI am running both Ubuntu and XP and have a local server for my computer on both systems. Both partitions have a www directory that is accessed when I type localhost into my browser.
I want to be able to work on the project in both systems and have the changes I make show in both. So my questions is how can I make "localhost" point to the windows www instead of the /var/www one when I start up the server?
in puTTy, what does the @ sign signify when it's right after a directory? ex.
pdf/
public_html/
video@
It is a symbolic link, however on another server, the same symbolic link does not have an @ sign after it.
Create the following directories: parent/child
Navigate to child and create a file named child (this is an executable file in my case, not sure if that makes a difference). I need to create two "link to executable" links in the parent.
I had assumed that this would work:
ln -sf ./child ../child1
ln -sf ./child ../child2
But that creates a "link to folder" (./child) in the parent directory. If I change it to:
ln -sf -t.. ./child child1
ln -sf -t.. ./child child2
I get an error, "ln: '../child': cannot overwrite directory".
If I do it from the parent directory (which I cannot do, this is part of a Makefile recipe):
ln -sf ./child/child ./child1
ln -sf ./child/child ./child2
It works. Note that I cannot alter the names of any directories or files. How do I create the links when the current directory is the child?
I am using Lubuntu 10.10 and have installed my application that I need. What I need is a link to the desktop that will execute the program from the /usr/share/test directory. When I execute the program I need to use "Sudo" in order to run in. So my questions is how would I add a symbolic link the desktop with the approipiate permission to run the executable. Also I need to add a custom icon the desktop.
View 7 Replies View RelatedI'm looking for some advice about how to implement the following functionality in my pet project.
There are two users on my system, user1 and user2. When user1 logs in he can do what he wants etc.. when user2 logs in I want to somehow link the entire file system to another place. In more detail when user2 logs in and does something like ls ~, he should see contents of /home/user1/extra/home/user2/ instead of /home/user2/
and when user2 does ls /usr/bin he should see contents of /home/user1/extra/usr/bin/
Is there a simple way to do this kind of operation. I have looked up the ln command, but I am a little unsure about how to show a completely different file structure to a particular user.
I did play around with ln and found that you can make "soft links" to directories. The problem being how can I link the user2 home directory /home/user2 to something like /home/user1/buffer/home/user2 . can I use something like ln -s /home/user1/buffer/home/user2 /home/user2 .. I guess not. I didn't want to try it as I wasn't sure so as to not hose my system.
There is a symlink from /var/www to a personal directory. FollowSymlink and chmod 755 are all set. It works perfectly until each morning I will get a "Symbolic link not allowed or link target not accessible" error. When I do a "sudo service apache2 restart", the problem will go away.
View 1 Replies View RelatedI have create a perl script, which create a text file, and it works well. But i want this to create in a specified directory.
THe scrip is:
Code:
#!/usr/bin/perl
use POSIX;
#Directory where the text file will be created.
$directory = '/space/data';
[Code]....
I am new to the Linux world and I am not sure if what I am trying to do is achievable or not. I am trying to make an image of my existing drives running Linux on a USB and I want to use the same image off the USB to clone more bootable hard drives. Something like what Ghost does in windows. The problem is using 'dd' the image is too big ( I have 1tb drives ) and then I am not sure how to convert these images back on to new drives so that they boot in the OS as well. i am not sure if there is a utility that would let you do that?
View 2 Replies View RelatedI've a user account in a remote machine. but it doesn't have a home directory in that machine.Is it possible to create a home directory without having root account details. If yes, how it can be done.
View 1 Replies View RelatedHow to create the user without creating home directory?
View 7 Replies View RelatedWe are in the process of pruning our directories to recuperate some disk space.
The 'algorithm' for the pruning/backup process consists of a list of directories and, for each one of them, a set of rules, e.g. 'compress *.bin', 'move *.blah', 'delete *.crap', 'leave *.important'; these rules change from directory to directory but are well known. The compressed and moved files are stored in a temporary file system, burned onto a blue ray, tested within the blue ray, and, finally, deleted from their original locations.
I am doing this in Python (basically a walk statement with a dictionary with the rules for each extension in each folder).
Do you recommend a better methodology for pruning file systems? How do you do it?
This may be a rookie mistake, but I created a user (new user) in Linux on a Ubuntu system and didn't actually create the home directory for this user. Now, when I log in, it says there are problems... If I delete the path home/<new user> and try to log in the system tells me I can use root as home directory but I will likely experience problems, and then it won't let me log in. What is the best way to create this directory with the appropriate permissions? Should I just create another user and delete this one?
View 1 Replies View Relatedjump into a Linux class in college with only 3 weeks left in the course. I thought I would be able to catch on, and go figure, it didn't exactly happen that way. I was given an assignment to do, and I am so far lost it isn't even funny. I need to create a directory structure, set up file security, create a step by step instruction manual on how to copy/delete said files, and create a guide to common Linux commands. How would I create these files in root and share them with the other users? and where can I find a list of common commands and their functions?
View 5 Replies View RelatedI'm trying to configure a script the deletes the file and directories with more than 10 weeks on my /tmp directory, this is what i'm trying to do:
Quote:
#!/bin/bash
#Script para borrado de ficheros y PDFs de /tmp
### Directorios/PDFs a borrar
[code]....
Actuaaly i am creating watch on one directory in which files are continuously coming.Is there any command which can give listing of all files who have come in last 24 hrs.
View 8 Replies View Related