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$ ln monday /home/chris
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To erase a file, you need to remove all its links. The name of a file is actually considered a link to that file-hence the command rm that removes the link to the file. If you have several links to the file and remove only one of them, the others stay in place and you can reference the file through them. The same is true even if you remove the original link-the original name of the file. Any added links will work just as well. In the next example, the today file is removed with the rm command. However, a link to that same file exists, called weather. The file can then be referenced under the name weather.
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$ ln today weather $ rm today $ cat weather The storm broke today and the sun came out. $
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Linux supports what are known as symbolic links. Links, as they have been described so far, are called hard links. Although hard links will suffice for most of your needs, they suffer from one major limitation. A hard link may in some situations fail when you try to link to a file on some other user's directory. This is because the Linux file structure can be physically segmented into what are called file systems. A file system can be made up of any physical memory device or devices, from a floppy disk to a bank of hard disks. Although the files and directories in all file systems are attached to the same overall directory tree, each file system physically manages its own files and directories. This means a file in one file system cannot be linked by a hard link to a file in another file system. If you try to link to a file on another user's directory that is located on another file system, your hard link will fail. Another consideration is that there are security issues with hard links, where a hard link could be used to access a secure area. To overcome this restriction, you use symbolic links. A symbolic link holds the pathname of the file to which it is linking. It is not a direct hard link but, rather, information on how to locate a specific file. Instead of registering another name for the same file as a hard link does, a symbolic link can be thought of as another symbol that represents the file's pathname. A symbolic link is another way of writing the file's pathname. You create a symbolic link using the ln command with the -s option. In the next example, the user creates a link called lunch to the file /home/george/veglist:
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$ ln -s lunch /home/george/veglist
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If you list the full information about a symbolic link and its file, you will find the information displayed is different. In the next example, the user lists the full information for both lunch and /home/george/veglist using the ls command with the -l option. The first character in the line specifies the file type. Symbolic links have their own file type represented by a l. The file type for lunch is l, indicating it is a symbolic link, not an ordinary file. The number after the term "group" is the size of the file. Notice the sizes differ. The size of the lunch file is only 4 bytes. This is because lunch is only a symbolic link-a file that holds the pathname of another file-and a pathname takes up only a few bytes. It is not a direct hard link to the veglist file.
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$ ls lunch /home/george/veglist lrw-rw-r-- 1 chris group 4 Feb 14 10:30 lunch -rw-rw-r-- 1 george group 793 Feb 14 10:30 veglist
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To erase a file, you need to remove only its hard links. If any symbolic links are left over, they will be unable to access the file. In this case, a symbolic link would hold the pathname of a file that no longer exists. Unlike hard links, you can use symbolic links to create links to directories. In effect, you can create another name with which you can reference a directory. If you use a symbolic link for a directory name, however, remember the pwd command always displays the actual directory name, not the symbolic name. In the next example, the user links the directory thankyou with the symbolic link gifts. When the user uses gifts in the cd command, the user is actually changed to the thankyou directory. pwd displays the pathname for the thankyou directory.
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