what is the command? what does it do?

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Here's an illustration to help you visualize it: If we change the contents of the data pointed to by either one of these files, the other file's contents are changed as well. Without arguments, shows current meta key mode.

Now let's use our symbolic link. If we run cat on it, it displays the contents of myfile. If we delete one of the files, we're deleting one of the links to the data. Each such link has the same name as the file which it links.

Linux Unix Symbolic Soft and Hard Links with ln Command

The ln command is a standard utility used to create a or a symlink to an existing file. The use of a hard link allows multiple to be associated with the same since a hard link points to the of a given file, the data of which is stored on. On the other hand, symbolic links are special files that refer to other files by. The ln command by default creates hard links, and when called with the ln -s creates symbolic links. Most prevent hard links to from being created since such a capability could disrupt the structure of a and interfere with the operation of other utilities. The ln command can however be used to create symbolic links to non-existent files. Both hard links and soft links can be created by the ln command. A given file on disk could have multiple links scattered through thewith all of the links being equivalent since they all associate with the same. Creating a link therefore does not copy the contents of the file but merely causes another name to be associated with the same contents. Each time a hard link is created, a that is a part of the gets incremented; a file is not deleted until its reference count reaches zero. However, hard links can only be created on the same ; this can prove to be a disadvantage. The content of the symbolic link is therefore the destination string, which can also be examined using the readlink command line utility. The symbolic link may contain an arbitrary string which does not refer to the location of an existing file. Such a symbolic link will fail until a file is created at the location which is contained by the symbolic link. By contrast, a symbolic link to an existing file will fail if the existing file is moved to a different location or renamed. The specification describes two ways of invoking the ln utility. Ln command in linux, if the -s option is specified, a symbolic link is created. If the -s option is specified, the -L and -P options are silently ignored. Ln command in linux more than one of the mutually-exclusive options -L and -P is specified the last option specified determines the behavior of the utility. If the -s option is not specified and neither a -L nor a -P ln command in linux is specified, the implementation defines which of the -L and -P options will be used as the default. If neither target file nor target directory are specified, links will be created in the current. Understanding the Linux Kernel 3rd ed.

Therefore, the operating system will always look for myfile. By default ln creates , which are merely additional names for an existing file. The default is to act as if -P was specified. If you do not specify the symbolic link, the ln command will create a new link in your current directory. Linux Commands — T Command Description tac Concatenate and print files in reverse order. If you delete or move the source file to a different location, the symbolic file will be left dangling. If two file names are provided as arguments, ln uses the second one, assuming that it is not the name of an existing file, as the name for the hard link to the first one. It supports creating a hard and symbolic links to data on disk. Symbolic links can hold arbitrary text; if later resolved, a relative link is interpreted in relation to its parent directory. How to make ln remove existing destination files of same name? The important thing to realize is that we did not make a copy of this data. This allows for convenient browsing of the external drive within the home directory.