Saidar is a curses-based tool for viewing the system statistics avail-able through libstatgrab. Statistics include CPU, processes, load, memory, swap, network I/O, disk I/O, and file system information.
Saidar can be installed by
apt-get command for Ubuntu and Debian:
sudo apt-get install saidar
Then you can execute this to get system statistics in command line:
-c to get colored output:
-d to set DELAY seconds between updates (default 3):
saidar -d 5