If you want to call the exact procedure that is done by the plug-in, then try this :
$ gmic image.jpg -gimp_fourier 0,1
for the FFT, and :
$ gmic imageFFT.jpg -gimp_fourier 1,1
for the invert transform.
If you want to call the exact procedure that is done by the plug-in, then try this :
$ gmic image.jpg -gimp_fourier 0,1
for the FFT, and :
$ gmic imageFFT.jpg -gimp_fourier 1,1
for the invert transform.