lndir - create a shadow directory of symbolic links to another directory tree
lndir [ -silent ] [ -ignorelinks ] [ -withrevinfo ]
  fromdir [ todir ]
The lndir program makes a shadow copy todir of a directory tree
  fromdir, except that the shadow is not populated with real files but
  instead with symbolic links pointing at the real files in the fromdir
  directory tree. This is usually useful for maintaining source code for
  different machine architectures. You create a shadow directory containing
  links to the real source, which you will have usually mounted from a remote
  machine. You can build in the shadow tree, and the object files will be in the
  shadow directory, while the source files in the shadow directory are just
  symlinks to the real files.
This scheme has the advantage that if you update the source, you
    need not propagate the change to the other architectures by hand, since all
    source in all shadow directories are symlinks to the real thing: just cd to
    the shadow directory and recompile away.
The todir argument is optional and defaults to the current
    directory. The fromdir argument may be relative (e.g., ../src) and is
    relative to todir (not the current directory).
Note that BitKeeper, CVS, CVS.adm, .git, .hg, RCS, SCCS, and .svn
    directories are shadowed only if the -withrevinfo flag is specified.
    Files with names ending in ~ are never shadowed.
If you add files, simply run lndir again. New files will be
    silently added. Old files will be checked that they have the correct
  link.
Deleting files is a more painful problem; the symlinks will just
    point into never never land.
If a file in fromdir is a symbolic link, lndir will
    make the same link in todir rather than making a link back to the
    (symbolic link) entry in fromdir. The -ignorelinks flag
    changes this behavior.
  - -silent
- Normally lndir outputs the name of each subdirectory as it descends
      into it. The -silent option suppresses these status messages.
- -ignorelinks
- Causes the program to not treat symbolic links in fromdir
      specially. The link created in todir will point back to the
      corresponding (symbolic link) file in fromdir. If the link is to a
      directory, this is almost certainly the wrong thing.
- This option exists mostly to emulate the behavior the C version of
      lndir had in X11R6. Its use is not recommended.
- -withrevinfo
- Causes any source control manager subdirectories (those named BitKeeper,
      CVS, CVS.adm, .git, .hg, RCS, SCCS, or .svn) to be treated as any other
      directory, rather than ignored.
The program displays the name of each subdirectory it enters, followed by a
  colon. The -silent option suppresses these messages.A warning message is displayed if the symbolic link cannot be
    created. The usual problem is that a regular file of the same name already
    exists.
If the link already exists but doesn't point to the correct file,
    the program prints the link name and the location where it does point.