LNDIR(1) X Version 11(Release 5) LNDIR(1)
NAME
lndir - create a shadow directory of symbolic links to another directory
tree
SYNOPSIS
lndir fromdir [todir]
DESCRIPTION
Lndir 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 NFS mounted from a machine of a
different architecture, and then recompile it. 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 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 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 RCS and SCCS directories are not shadowed.
Note that if you add files, you must run lndir again. Deleting files is
a more painful problem; the symlinks will just point into never never
land.
BUGS
Patch gets upset if it cannot change the files. You should never run
patch from a shadow directory anyway.
You need to use something like
find todir -type l -print | xargs rm
to clear out all files before you can relink (if fromdir moved, for
instance). Something like
find . \! -type d -print
will find all files that are not directories.
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