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Ch 11 File Sharing
Unix The Textbook 2nd Edition
17
Computer Science
Undergraduate 2
11/01/2014

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Term
A way to establish a connection between the file to be shared and the directory of the users who want to have access to this file.
Definition
a link
Term
A pointer to the inode of a file
Definition
hard link
Term
Create a hard link to existing-file and name it new-file
Definition
ln [options] existing-file new file
note: user must have execute privileges for all the directories in the path leading to the file.
Term
Create hard links to the ordinary files in existing-file-list in 'directory'; links have the same name as the original file
Definition
ln [options] existing-file-list directory
Term
If hard link is created to a file and the file is then removed is the file still accessible on disk? Explain.
Definition
Yes, it is still accessible. The hard link had the inode number and file attributes that the original file had, except that the link count is decremented by 1.
Term
Create hard links to all the files to all nondirectory files in the ~/unixbook/examples/dir1 and have the hard links reside in ~/unixbook/examples/dir2
Definition
ln -f ~/unixbook/examples/dir1/* ~unixbook/examples/dir2
note: You must have execute permission for the directories in the pathname
Term
Hard links cannot be established between files that are on different __ __
Definition
file systems
Term
When a file is with multiple hard links is moved to another file system which is a different file system than the one the file currently resides in what is the result. Be specific.
Definition
The link count for the file and hard link is decremented by one. The files have different inodes. The ln command cannot link the file to the hard link because the two files are in different file systems.
Term
Only a ___ can create a hard link to a directory
Definition
superuser
Term
Command used to create a symbolic link to a file
Definition
soft link
Term
Describe the attributes of a soft link that are different than a hard link
Definition
1. the original file and the link file have different inode numbers.
2. The original file is of ordinary file type (-) and the link file is of link type (l).
3. The link count is 1 for both files.
4. the file sizes are different.
5. The name of the link is is followed by ->original_file
Term
What is the content of a soft link file
Definition
the pathname of the existing file
Term
command to create a soft link to a file
Definition
ln -s file-name
Term
Create soft links to all nondirectory files in the ~/unixbook/examples/dir1 and have the hard links reside in ~/unixbook/examples/dir2; links have the same name as the original file
Definition
ln -sf d~/unixbook/examples/dir1/* ~/unixbook/examples/dir2
Term
Can you create a soft link to a directory. Give an example and put the soft link in the home directory.
Definition
Yes. ln -sf dir1 ~
Term
Create a soft link called demo1 in a directory in bob's home direct that points to directory dir1 in your home directory
Definition
ln -sf ~/dir1 /users/bob/dir1
note; you must have execute permission for bob's home directory, and execute and write permission for dir1. The user bob must have proper access permissions for dir1 in your directory structure to access this file.
Term
Give one weakness of soft links
Definition
If the file that the link points to is moved from one directory to another, it no longer be accessed via the link, which is a pathname to the file.
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