Increase the volume of an audio file by 2x

sox

  • Sound eXchange: play, record and convert audio files.
    Audio formats are identified by the extension.
    More information: <http://sox.sourceforge.net>.
  • Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

sox -v 2.0 {{input_audiofile}} {{output_audiofile}}

click the source code to copy install sox on any operating system with command-not-found.com