excellent script of preservation and installation of a sound

amixer_swap.sh

#!/bin/bash -

FILE_SAVE_TEMPLATE="alsa_"

read_params() {
    local number_card=$1
    local numidlist=$(amixer -D hw:"$number_card" controls | awk --re-interval 'BEGIN{FS=","}{print $1}')
    local numarray=($numidlist)
    local params=()

    for key in "${numarray[@]}"
    do
        value=$(amixer -D hw:"$number_card" cget $key | awk --re-interval 'BEGIN {FS=": values="}/: values/ {print $2}')
        if [[ $value =~ ^[0-9]{1,3},[0-9]{1,3}|^[0-9]{1,3}|on,on|off,off|on|off ]]
        then
            params[$key]="$value"
        fi
    done

    if [[ -f "$FILE_SAVE_TEMPLATE""$number_card" ]]
    then
        rm "$FILE_SAVE_TEMPLATE""$number_card"
    fi

    for i in ${!params[@]}
    do
        printf "$i:${params[$i]}\n" >> "$FILE_SAVE_TEMPLATE""$number_card"
    done
}

set_params () {
    local number_card=$1
    local params=($(cat "$FILE_SAVE_TEMPLATE""$number_card"))
    for i in "${params[@]}"
    do
        key=$(printf "$i" | awk --re-interval 'BEGIN { FS=":" } { print $1 }')
        value=$(printf "$i" | awk --re-interval 'BEGIN { FS=":" } { print $2 }')
        if [[ $value =~ ^[0-9]{1,3},[0-9]{1,3}|^[0-9]{1,3}|on,on|off,off|on|off ]]
        then
            amixer -D hw:"$number_card" cset numid=$key $value 1>/dev/null 2>/dev/null
        fi
    done
}

case "$1" in
    read)
        for i in $(awk --re-interval "/^.[0-9]{1,2}/"'{print $1}' /proc/asound/cards | xargs)
        do
            read_params $i
        done
        ;;
    set)
        for i in $(awk --re-interval "/^.[0-9]{1,2}/"'{print $1}' /proc/asound/cards | xargs)
        do
            set_params $i
        done
        ;;
    *)
        echo "read set"
        ;;
esac