Making sound spectrum images from command line

Question

Most of the audio editors are able to show us different kinds of audio analysis like this:

• Wave form (whole file);
• spectral frequency (whole file);
• spectrum analysis (for a slice).

The generated images can be saved one way or another.

Is there a command line alternative to do this?

Windows 7. A multi-OS solution is preferred.

Answer 1

Imagemagick would be the solution, but the screen capture does not seem to work in Windows (it's looking for an X server).

Refer to the answers to this similar question here for other options.

Answer 2

One of three tasks could be performed with SoX:

sox file.wav -n spectrogram