open ALSA playback devices

#!/bin/bash

for (( i=0; i<10; i++ )); do
    if [ -d "/proc/asound/card${i}" ]; then
        cname="$( cat /proc/asound/cards | grep -E "^ ${i} " | cut -d '[' -f 2 | cut -d ']' -f 1 | tr -d ' ' )"
        echo "Card ${i} (${cname}):"
        for (( j=0; j<10; j++ )); do
            if [ -d "/proc/asound/card${i}/pcm${j}p" ]; then
                echo
                echo "* pcm${j}p:"
                cat "/proc/asound/card${i}/pcm${j}p/sub0/hw_params"
            fi
        done
        echo "--------------------------------------------------------------------------------"
    fi
done