SYNOPSIS
	string file_name()
	string file_name(object ob)

DESCRIPTION
	Get the file name of an object or if no argument is given of the current
	object. If the object is a cloned object, then it will not have a
	corresponding file name, but rather a new name based on the original
	file name.
	
	The returned name always begins with '/' (absolute path),
	except when the parser runs in COMPAT (-o) mode.

EXAMPLES
	find_object(file_name(ob)) == ob
	
	This is guaranteed to be true for all objects ob that are not
	destructed.
	
	sizeof(explode(file_name(ob), "#")) == 1
	
	This is always true if ob is a blue print.
	
SEE ALSO
	find_object(E)