rtl_sdr to baudline script for mac os

rtl_baudline.sh

#!/bin/bash

if [[ $# -ne 3 ]]; then
    echo "usage: rtl_baudline.sh <frequency> <samplerate> <gain>"
    exit 1
fi

FFT=$((${2}/1000000*2048))

rtl_sdr -f $1 -s $2 -g $3 - | /Applications/baudline.app/Contents/Resources/baudline \
  -stdin \
  -quadrature \
  -record \
  -channels 2 \
  -flipcomplex \
  -format s8 \
  -overlap 100 \
  -memory 512 \
  -fftsize ${FFT} \
  -basefrequency $1 \
  -samplerate $2