Usage: mklinks  link-rootdir real-rootdir subdir...

Purpose:
	Create a "shadow" tree of symlinks pointing at real files:

	For each non-directory file  real-rootdir/subdir/XXX, we create
	a symbolic link named link-rootdir/subdir/XXX.
	For each directory file  real-rootdir/subdir/DDD, we create
	a directory link-rootdir/subdir/DDD, and recursively invoke
	mklinks  on those files.

Example:
	If you have
		/opt/xyz/bin/prog1
		/opt/xyz/bin/prog2
		/opt/xyz/man/man1/prog1.1
		/opt/xyz/man/man1/prog2.1
		/opt/xyz/man/man4/prog1.4

	Then the command

		mklinks /opt /opt/xyz   bin man

	will create links in /opt/bin and /opt/man that shadow the
	actual files in /opt/xyz/bin and /opt/xyz/man.

USE WITH CAUTION -- you can create lots of unwanted files!