How to create mplayer playlist in Ubuntu

1 - Open a terminal within your directory that includes the media files ("mp3" for this case) to be added to the playlist.

2 - Use find command with -name option to list files (lists recursively by default) and send this list into your "playlistName.m3u" ("Totem Player" in Ubuntu considers .m3u files)

Here is the script: (GNOME Terminal 2.28.1)

$find -name '*.mp3' >playlistName.m3u