bench : command not found

[Subhra Jyoti Bhuyan]

I am trying to install frappe / erpnext. Installed bench using the following commands:

cd ~

wget https://raw.githubusercontent.com/frappe/bench/master/install_scripts/setup_frappe.sh
sudo bash setup_frappe.sh

Now if I try to install erpnext, it says "bench : command not found".

Did I miss something? I am using Centos 5.