I was using bash3 up to now, and just got a copy of the latest version
$ ./bash --version GNU bash, version 4.1.0(1)-release (i686-pc-linux-gnu) Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software; you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. $
What are the major changes/feature additions in version 4 over version 3?