cat /proc/cmdline >/tmp/cmdline

replace_cmd() {
    sed --regexp-extended "s/$1=[^ ]*/$1=$2/g" /tmp/cmdline -i
}

getcmdline() {
    local _line
    local _i
    local CMDLINE_ETC_D
    local CMDLINE_ETC
    unset _line

    if [ -e /etc/cmdline ]; then
        while read -r _line; do
            CMDLINE_ETC="$CMDLINE_ETC $_line";
        done </etc/cmdline;
    fi
    for _i in /etc/cmdline.d/*.conf; do
        [ -e "$_i" ] || continue
        while read -r _line; do
            CMDLINE_ETC_D="$CMDLINE_ETC_D $_line";
        done <"$_i";
    done
    ## NOTE: We modify this to be able to alter kernel command line arguments
    ## at runtime.
    if [ -e /tmp/cmdline ]; then
        read -r CMDLINE </tmp/cmdline;
        CMDLINE="$CMDLINE_ETC_D $CMDLINE_ETC $CMDLINE"
    else
    ##
        if [ -e /proc/cmdline ]; then
            read -r CMDLINE </proc/cmdline;
            CMDLINE="$CMDLINE_ETC_D $CMDLINE_ETC $CMDLINE"
        fi
    fi
    printf "%s" "$CMDLINE"
}