id3tag:tldr:414d1

The command "id3tag --album=${album} ${*-mp3}" is likely used to edit or modify the album tag of multiple MP3 files at once. Here is an explanation of each part of the command:

• "id3tag": This is the name of the command or program being executed. It is responsible for interacting with ID3 tags, which are metadata tags embedded in MP3 files that contain information like artist, album, track title, etc.

• "--album=${album}": This is an option provided to the "id3tag" command. The double hyphens indicate it is a long option, and "--album" specifies that the following argument will be the album name. "${album}" suggests that the value for the album should be provided as an environment variable.

• "${-mp3}": This is a placeholder for a list of MP3 files. The "$" is a shell parameter that represents all the arguments passed to the script or command. The "-mp3" is added to indicate that only files with the ".mp3" extension should be included.

Combining these parts, the command can be interpreted as follows:

• The "id3tag" command is being executed.
• The album name provided as an environment variable (stored in the "${album}" variable) will be used to update the album tag of the MP3 files.
• The MP3 files passed as arguments (with ".mp3" extension) will be modified according to the album tag provided.

Overall, this command allows for batch editing of the album tag of multiple MP3 files simultaneously.