aplay:tldr:89900

The given command is used to play an audio file with specific configurations using the aplay command-line audio player.

Here is a breakdown of the command:

• aplay: This is the command to run the aplay utility which plays audio files.
• --channels=${1}: This option sets the number of audio channels to be used. ${1} refer to the first argument passed to the command when executing it. It could be a value indicating the desired number of channels.
• --file-type ${raw}: This option specifies the file type of the audio file to be played. ${raw} refers to the value raw, indicating that the audio file is in raw format.
• --rate=${22050}: This option sets the sample rate of the audio file. The value of ${22050} suggests a sample rate of 22050 Hz.
• --format=${mu_law}: This option specifies the audio format. ${mu_law} assumes the value mu_law, which indicates that the audio file is encoded using mu-law encoding.
• ${filename}: This placeholder represents the name of the audio file to be played. It should be replaced with the actual file name when running the command.

In summary, the command plays an audio file using aplay, allowing you to customize the number of channels, file type, sample rate, format, and specifying the file name to be played.