bash (Bourne Again SHell) comes with pretty much every Unix-like OS these days. If you ever wonder what exact version of bash shell you have on your system, here's how you find out: just use the –version parameter in the command line.
Using /bin/bash to tell its version
On RedHat Linux, this is how it might look:
bash-2.05b$ /bin/bash --version GNU bash, version 2.05b.0(1)-release (i386-redhat-linux-gnu) Copyright (C) 2002 Free Software Foundation, Inc.
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