mp3info:tldr:36dc7

The command "mp3info -i ${filename-mp3}" is used to retrieve information about an MP3 file specified by the variable "filename-mp3". Here's a breakdown of the components:

1. "mp3info" - This is the name of the program or command being executed.
2. "-i" - It is an option or argument passed to the "mp3info" command, meaning it is requesting information about the specified MP3 file.
3. "${filename-mp3}" - This is a variable denoted by the dollar sign "$". It holds the name or path of the MP3 file that you want to retrieve information for. The "-mp3" part at the end seems to be an extension indicating that it is an MP3 file.

By executing this command, the "mp3info" program will read the specified MP3 file and display various details about it, such as the title, artist, album, duration, bitrate, encoding format, and more. The actual output may vary depending on the specific tool or version being used.