You can use mplayer to play MP3 files from a playlist file in Linux or Unix. To do this, you’ll need to create a playlist file that contains the list of MP3 files that you want to play.
Here’s an example of how you can create a playlist file:
# Create a file named "playlist.m3u"
# Use a text editor to add the list of MP3 files
/path/to/song1.mp3
/path/to/song2.mp3
/path/to/song3.mp3
...
Once you have created the playlist file, you can use the following command to play the MP3 files in the playlist file:
mplayer -playlist playlist.m3u
This will start mplayer and play the MP3 files in the playlist file in the order they are listed. You can use the standard mplayer controls, such as space to pause/play, left and right to skip forward/backward, up and down to increase/decrease volume, and so on, to control playback.