LN(1) General Commands Manual LN(1)
ln - make a link
ln name1 [ name2 ]
A link is a directory entry referring to a file; the same file
(together with its size, all its protection information, etc.) may
have several links to it. There is no way to distinguish a link to a
file from its original directory entry; any changes in the file are
effective independently of the name by which the file is known.
Ln creates a link to an existing file name1. If name2 is given, the
link has that name; otherwise it is placed in the current directory and
its name is the last component of name1.
It is forbidden to link to a directory or to link across file systems.