hcitool:tldr:d7687

The command "hcitool auth ${bdaddr}" is used in Linux systems to authenticate a Bluetooth device with a specified Bluetooth address (bdaddr).

Here's how the command works:

1. "hcitool" is a Bluetooth management command-line tool in Linux. It allows users to configure and interact with Bluetooth devices.
2. "auth" is a specific command within hcitool to authenticate a Bluetooth device.
3. "${bdaddr}" is a placeholder for the Bluetooth address (bdaddr) of the device you want to authenticate. The actual Bluetooth address should be provided when running the command.

By executing this command with the appropriate Bluetooth address, the operating system initiates an authentication process with the specified Bluetooth device. This process verifies the device's identity and establishes a secure connection.