Shell script question

[Digish Reshamwala]

Hi,

I am trying to run one of my installation shell script using the 
command-

bash resetapp.sh

& it gives me the error as-
'bash: not found'

How do I install bash?  I am using FreeBSD/i3b6 5.2.1

Also, whats the command to check which version of FreeBSD I am using?

Please help me out,

Thanks a lot,
macuser