Sponsored Content
Full Discussion: Hard link
Top Forums UNIX for Advanced & Expert Users Hard link Post 302168034 by Perderabo on Saturday 16th of February 2008 03:04:29 PM
Old 02-16-2008
A directory must have two special entries in it. A entry called . must exist and be a link to the directory itself. And an entry called .. must exist and be an link to the parent directory. The link system call does not perform these operations. In the old days, it took 3 link operations to create a directory. Now there is just a single mkdir system call to invoke. And root should be using mkdir, not link. Also by using silly combinations of link and unlink it is possible to break pieces of the file system off from the tree structure, create loops and even remove . or .. from a directory. I doubt that you could recover from
unlink /usr/bin
or something like that.
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Differences between hard link and soft link

Hi all! I'd like to know the differences between hard links and soft links. I've already read the ln manpage, but i'm not quite sure of what i understood. Does a hard link sort of copy the file to a new name, give it the same inode number and same rights? What exactly should I do to do this:... (3 Replies)
Discussion started by: penguin-friend
3 Replies

2. UNIX for Dummies Questions & Answers

Why use a hard link

Someone asked me a question today about the difference between a hard link and a soft link. That got me thinking and maybe someone can answer. Why would I ever use a hard link if I can use a soft link instead? (2 Replies)
Discussion started by: dangral
2 Replies

3. UNIX for Dummies Questions & Answers

reg hard link

Hi, Is it possible to have a hard link across partitions.... I need to take a data from one partition and write to to another partitions..If any modification of file done in Partition 1 ,it should be immediately reflected in partition2..I came to know hard link might work.... Is there... (1 Reply)
Discussion started by: deep
1 Replies

4. UNIX for Dummies Questions & Answers

Difference between hard link and soft link in unix

Hi All, Can any one please explain me what is the difference between hard link and soft link in UNIX. Thanks in advance Raja Chokalingam. (2 Replies)
Discussion started by: RAJACHOKALINGAM
2 Replies

5. UNIX for Dummies Questions & Answers

need some info about symbolic link and hard link

hello folks how y'all doin well i have some questions about symbolic link and hard link hope some one answer me 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... (2 Replies)
Discussion started by: detective linux
2 Replies

6. UNIX for Dummies Questions & Answers

Hard Link vs SOft Link????

Hi PLease let me know the usage of Hard Link vs Soft Link i.e what is the basic difference and what happens when one file is changed or deleted in both the cases??? thanks (3 Replies)
Discussion started by: skyineyes
3 Replies

7. UNIX for Dummies Questions & Answers

Difference between hard link and soft link

Hi Experts, Please help me out to find out difference between a hard link and a soft link. I am new in unix plz help me with some example commands ( for creating such links). Regards S.Kamakshi :) (2 Replies)
Discussion started by: kamakshi s
2 Replies

8. Shell Programming and Scripting

Find Hard Link

Goodmorning everybody. A question: How can i match if a file is an hard link or not? (6 Replies)
Discussion started by: Guccio
6 Replies

9. UNIX for Advanced & Expert Users

Hard Link Examples

Hello, Please move this if I chose the wrong forum category. This question pertains to Unix and Linux I believe. I google the difference between hard and symbolic/soft links and I understand the difference. What I am trying to find is a real example of a hard link being used in a Operating... (11 Replies)
Discussion started by: jaysunn
11 Replies

10. Shell Programming and Scripting

Creating hard link with name

How can I create a hard link to a file, then rename the hard link to a different name? (2 Replies)
Discussion started by: fhill2
2 Replies
RMDIR(2)						      BSD System Calls Manual							  RMDIR(2)

NAME
rmdir -- remove a directory file SYNOPSIS
#include <unistd.h> int rmdir(const char *path); DESCRIPTION
rmdir() removes a directory file whose name is given by path. The directory must not have any entries other than '.' and '..'. RETURN VALUES
A 0 is returned if the remove succeeds; otherwise a -1 is returned and an error code is stored in the global location errno. ERRORS
The named file is removed unless: [EACCES] Search permission is denied for a component of the path prefix. [EACCES] Write permission is denied on the directory containing the link to be removed. [EBUSY] The directory to be removed is the mount point for a mounted file system. [EFAULT] Path points outside the process's allocated address space. [EIO] An I/O error occurs while deleting the directory entry or deallocating the inode. [ELOOP] Too many symbolic links are encountered in translating the pathname. This is taken to be indicative of a looping symbolic link. [ENAMETOOLONG] A component of a pathname (possibly expanded by a symbolic link) exceeds {NAME_MAX} characters, or an entire path name exceeded {PATH_MAX} characters. [ENOENT] The named directory does not exist. [ENOTDIR] A component of the path is not a directory. [ENOTEMPTY] The named directory contains files other than '.' and '..' in it. [EPERM] The directory containing the directory to be removed is marked sticky, and neither the containing directory nor the direc- tory to be removed are owned by the effective user ID. [EROFS] The directory entry to be removed resides on a read-only file system. SEE ALSO
mkdir(2), unlink(2) HISTORY
The rmdir() function call appeared in 4.2BSD. 4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution
All times are GMT -4. The time now is 04:47 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy