NAME:
	fd
 PURPOSE:
	Kinda-kludgy-but-it-works wrapper for executable fd
 RESTRICTIONS:
	Not been fully tested
 PROCEDURE:
	The script has to be sourced, rather than directly executed.
	Libsd writes the proper CD command into the file $TUB/OSExitCmd.tmp
	The script executes sd, checks for the existence of the temporary
	file; executes the contents and deletes it.