Is there a tool to display WiFi information in console?

Under Linux, you can use the iw* series of commands to configure and display information about wireless networks:

• iwconfig - configure a wireless network interface
• iwlist - Get more detailed wireless information from a wireless interface
• iwpriv - configure optionals (private) parameters of a wireless network interface
• iw - show / manipulate wireless devices and their configuration

sudo iwlist wlan0 scan

Assuming your wireless is wlan0, of course. If you're not sure, iwconfig should tell you.

Here is a rather comprehensive list. One particularly nice way is:

watch -n 1 cat /proc/net/wireless