gistfile1.txt

#!/bin/bash
# j2x - a simple JACK 2 playback device switcher by Dan MacDonald 2014. Licensed under the GNU GPL v3

# Check user has kdialog installed
if ! command -v kdialog >/dev/null; then
  echo You must install kdialog to use j2x. Debian and Ubuntu users should install kde-baseapps-bin
  exit 1
fi

# Check user has jack_control installed
if ! command -v jack_control >/dev/null; then
  kdialog --error "You need jack_control to use j2x.\njack_control is included with JACK2 (jackd2)"
  exit 1
fi

# Get list of attached ALSA devices and format output for kdialog menu 
ALSA_DEVICES=$(cat /proc/asound/cards | cut -c 5-19 | awk 'NR%2 != 0'| sed 's/ *$//' | awk '{print $0,$0;}' | tr '\n' ' ')
DEVICE_CHOICE=0

while [ DEVICE_CHOICE != "1" ]; do
# Display and switch between ALSA devices
DEVICE_CHOICE=$(kdialog --menu "Select JACK2 output device:" $ALSA_DEVICES)
  jack_control dps playback hw:$DEVICE_CHOICE,0
  jack_control sm
done