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Take a look at sox

Quoting man sox:

SoX - Sound eXchange, the Swiss Army knife of audio manipulation


SoX is a command-line audio processing  tool,  particularly  suited  to
making  quick,  simple  edits  and to batch processing.  If you need an
interactive, graphical audio editor, use audacity(1).

So, it should be a nice fit as a companion command line alternative to audaciy!