How to check what version of a package is available in the current ubuntu?

Peng Yu pengyu.ut at
Fri Feb 12 16:52:48 UTC 2010

My bash is of the following version. I'm wondering if I want to update
bash what version I will get.

$ bash --version
GNU bash, version 3.2.39(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2007 Free Software Foundation, Inc.

I searched on the ubuntu website. There are too many related packages.
Could somebody let me know which one will be used when bash is

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