pyrit:tldr:cd59e

This command is used to perform an attack on a pre-computed hash database using Pyrit, which is a tool used for performing GPU (graphics processing unit) accelerated WPA/WPA2-PSK (Wi-Fi Protected Access/Wi-Fi Protected Access 2-Pre-Shared Key) password cracking.

Here is a breakdown of the command:

• pyrit: This is the command to run the Pyrit tool.
• -r ${filename}: -r is a flag indicating that the following argument is the path to a captured handshake file. ${filename} is a placeholder that should be replaced with the actual filename of the captured handshake file. The handshake file is a packet capture file that contains the four-way handshake necessary to crack the WPA/WPA2 password.
• attack_db: This is a command in Pyrit to start the attack using the pre-computed hash database. The hash database consists of pre-calculated password hashes created using either the pyrit batch or pyrit pcap2hcx command.

The command essentially loads the captured handshake file and uses it to launch an attack on the pre-computed hash database, attempting to crack the Wi-Fi password associated with the captured handshake.