It depends on what do you mean for hide/unhide. The most simple answer to your question is: all files/directories whose name begins with a dot "." are not visible by the command ls or from a window, unless you tell explicitly to show them. BTW, I don't believe this is what you're looking for, since this is the default behaviour on most systems, aren't you?
Last edited by colucix; 08-06-2007 at 08:48 AM.