sine-followed-by-silence.sh

#!/usr/bin/env bash

# create 1 second 440Hz sine wave
sox -n -c 1 -r 44100 sine.wav synth 1 sine 440

# create 1 second of silence
sox -n -c 1 -r 44100 silence.wav trim 0 1

# create 1 second 440Hz sine wave followed by 1 second of silence
sox -V sine.wav silence.wav output.wav 

# output times followed by amplitudes
sox output.wav output.dat

# create spectrogram
sox output.wav -n spectrogram -o output-spectrogram.png

# create waveform
ffmpeg -i output.wav -filter_complex showwavespic -frames:v 1 output-waveform.png