(coreutils.info)link invocation

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12.1 `link': Make a hard link via the link syscall
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`link' creates a single hard link at a time.  It is a minimalist
interface to the system-provided `link' function.  *Note Hard Links:
(libc)Hard Links.  It avoids the bells and whistles of the more
commonly-used `ln' command (Note: ln invocation).  Synopsis:

     link FILENAME LINKNAME

   FILENAME must specify an existing file, and LINKNAME must specify a
nonexistent entry in an existing directory.  `link' simply calls `link
(FILENAME, LINKNAME)' to create the link.

   On a GNU system, this command acts like `ln --directory
--no-target-directory FILENAME LINKNAME'.  However, the `--directory'
and `--no-target-directory' options are not specified by POSIX, and the
`link' command is more portable in practice.

   An exit status of zero indicates success, and a nonzero value
indicates failure.