Responding to the yet un-answered part of your OT query:
You can get the BASH version by:

$ echo $BASH_VERSION
4.2.25(1)-release

# Just the Major version:
echo $BASH_VERSINFO
4
[download]

Another alternative:

$ bash --version
GNU bash, version 4.2.25(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gp
+l.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
[download]

or even: (Ctrl-x Ctrl-v) , which shows

GNU bash, version 4.2.25(1)-release (x86_64-pc-linux-gnu)
[download]