freebsd man page for link

LN(1)							    BSD General Commands Manual 						     LN(1)

NAME
     ln, link -- link files

SYNOPSIS
     ln [-L | -P | -s [-F]] [-f | -iw] [-hnv] source_file [target_file]
     ln [-L | -P | -s [-F]] [-f | -iw] [-hnv] source_file ... target_dir
     link source_file target_file

DESCRIPTION
     The ln utility creates a new directory entry (linked file) for the file name specified by target_file.  The target_file will be created with
     the same file modes as the source_file.  It is useful for maintaining multiple copies of a file in many places at once without using up stor-
     age for the ``copies''; instead, a link ``points'' to the original copy.  There are two types of links; hard links and symbolic links.  How a
     link ``points'' to a file is one of the differences between a hard and symbolic link.

     The options are as follows:

     -F    If the target file already exists and is a directory, then remove it so that the link may occur.  The -F option should be used with
	   either -f or -i options.  If none is specified, -f is implied.  The -F option is a no-op unless -s option is specified.

     -L    When creating a hard link to a symbolic link, create a hard link to the target of the symbolic link.  This is the default.  This option
	   cancels the -P option.

     -P    When creating a hard link to a symbolic link, create a hard link to the symbolic link itself.  This option cancels the -L option.

     -f    If the target file already exists, then unlink it so that the link may occur.  (The -f option overrides any previous -i and -w
	   options.)

     -h    If the target_file or target_dir is a symbolic link, do not follow it.  This is most useful with the -f option, to replace a symlink
	   which may point to a directory.

     -i    Cause ln to write a prompt to standard error if the target file exists.  If the response from the standard input begins with the char-
	   acter 'y' or 'Y', then unlink the target file so that the link may occur.  Otherwise, do not attempt the link.  (The -i option over-
	   rides any previous -f options.)

     -n    Same as -h, for compatibility with other ln implementations.

     -s    Create a symbolic link.

     -v    Cause ln to be verbose, showing files as they are processed.

     -w    Warn if the source of a symbolic link does not currently exist.

     By default, ln makes hard links.  A hard link to a file is indistinguishable from the original directory entry; any changes to a file are
     effectively independent of the name used to reference the file.  Directories may not be hardlinked, and hard links may not span file systems.

     A symbolic link contains the name of the file to which it is linked.  The referenced file is used when an open(2) operation is performed on
     the link.	A stat(2) on a symbolic link will return the linked-to file; an lstat(2) must be done to obtain information about the link.  The
     readlink(2) call may be used to read the contents of a symbolic link.  Symbolic links may span file systems and may refer to directories.

     Given one or two arguments, ln creates a link to an existing file source_file.  If target_file is given, the link has that name; target_file
     may also be a directory in which to place the link; otherwise it is placed in the current directory.  If only the directory is specified, the
     link will be made to the last component of source_file.

     Given more than two arguments, ln makes links in target_dir to all the named source files.  The links made will have the same name as the
     files being linked to.

     When the utility is called as link, exactly two arguments must be supplied, neither of which may specify a directory.  No options may be sup-
     plied in this simple mode of operation, which performs a link(2) operation using the two passed arguments.

EXAMPLES
     Create a symbolic link named /home/src and point it to /usr/src:

	   # ln -s /usr/src /home/src

     Hard link /usr/local/bin/fooprog to file /usr/local/bin/fooprog-1.0:

	   # ln /usr/local/bin/fooprog-1.0 /usr/local/bin/fooprog

     As an exercise, try the following commands:

	   # ls -i /bin/[
	   11553 /bin/[
	   # ls -i /bin/test
	   11553 /bin/test

     Note that both files have the same inode; that is, /bin/[ is essentially an alias for the test(1) command.  This hard link exists so test(1)
     may be invoked from shell scripts, for example, using the if [ ] construct.

     In the next example, the second call to ln removes the original foo and creates a replacement pointing to baz:

	   # mkdir bar baz
	   # ln -s bar foo
	   # ln -shf baz foo

     Without the -h option, this would instead leave foo pointing to bar and inside foo create a new symlink baz pointing to itself.  This results
     from directory-walking.

     An easy rule to remember is that the argument order for ln is the same as for cp(1): The first argument needs to exist, the second one is
     created.

COMPATIBILITY
     The -h, -i, -n, -v and -w options are non-standard and their use in scripts is not recommended.  They are provided solely for compatibility
     with other ln implementations.

     The -F option is a FreeBSD extension and should not be used in portable scripts.

SEE ALSO
     link(2), lstat(2), readlink(2), stat(2), symlink(2), symlink(7)

STANDARDS
     The ln utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').

     The simplified link command conforms to Version 2 of the Single UNIX Specification (``SUSv2'').

HISTORY
     An ln command appeared in Version 1 AT&T UNIX.

BSD
								 November 2, 2012							       BSD