afplay:tldr:350d6

The command "afplay --rate ${2} ${filename}" is used to play an audio file with a specified playback rate. Let's break down the components:

• "afplay" is a command-line utility on macOS that allows you to play audio files.
• "--rate" is an option that specifies the playback rate for the audio file.
• "${2}" is a parameter that represents the value provided as the second argument when running the command. It could be any numeric value that determines the playback rate.
• "${filename}" is another parameter that represents the name or path of the audio file you want to play.

When executing the command, the value of "${2}" will determine the rate at which the audio file is played. For example, if you run the command "afplay --rate 1.5 music.mp3", it will play the "music.mp3" file at a rate of 1.5 times its original speed. Similarly, a value of 0.5 would play the audio at half speed.

Note that this command is specific to macOS and may not work on other operating systems without adjustments.