arecord:tldr:28266

This command is a Linux command that uses the "arecord" utility, which is used for recording and playing sound. Here is the breakdown of the command:

• arecord: The actual command that is being executed.
• -vv: This option sets the "verbose" mode, which provides more detailed information about the recording process.
• --format=cd: This option specifies the desired audio format for the recorded sound, in this case, it is set to "cd" format. CD format generally refers to 16-bit, 44.1 kHz audio.
• --duration=${10}: This option sets the duration of the recording. The variable ${10} is used to refer to the 10th input parameter passed to the command. So, the actual duration of the recording will be determined by the value provided as the 10th parameter when executing the command.
• ${filename-wav}: This specifies the desired file name for saving the recorded sound. Similar to the previous option, the variable ${filename-wav} refers to the input parameter that will determine the name of the output file. It is expected to be a file name with the ".wav" extension.

In summary, this command sets up a recording using the "arecord" utility with verbose mode enabled and records sound in CD format, specifying the duration and the desired file name for the output file.