saidar is a curses-based tool for viewing the system statistics available through libstatgrab. Statistics include CPU, processes, load, memory, swap, network I/O, disk I/O, and file system information.
This utility has now become part of my toolbox collection now and I install it on almost everything now. It’s extremely handy to take a quick look at everything about the system, as some other tools might only show you CPU or disk and so forth.
apt-get install saidar
yum install statgrab-tools
* requires epel
A simple saidar in the terminal will kick it off, however I prefer the colour switch option with: