SoX

Sound eXchange, abbreviated SoX, is a free cross-platform digital audio editor, licensed under the GNU General Public License, and distributed by Chris Bagwell through SourceForge.net. SoX is written in standard C, and has a command-line interface.

On Unix-like systems, SoX (as the play command) is commonly provided as the system audio file player.

Read more about SoX:  History, Features, Examples