iw:tldr:ef40a

The command is used to display the link state and signal quality of a wireless network interface.

Here's a breakdown of the command:

1. iw: It is a command-line utility for configuring and showing information about wireless network interfaces.

2. dev: This option specifies that we want to display information about a specific device.

3. ${wlp}: It is a placeholder for the name of the wireless network interface that you want to check. You need to replace ${wlp} with the name of the actual interface (e.g., wlp0s20f3).

4. link: This subcommand is used to display the link status and signal quality of the specified device.

By running this command with the appropriate interface name, you can view information such as the link status (disconnected, authenticated, etc.), signal strength, and signal quality (represented as a percentage).