как достоверно определить какой дистрибутив находится на файловой системе?

function get_distro_name {
    if [[ -r '/etc/lsb-release' ]]; then
        . /etc/lsb-release
        [[ "$DISTRIB_ID" ]] && n="$DISTRIB_ID"
    elif [[ -r '/etc/release' ]]; then
        n=`head -1 /etc/release | sed 's/ *\([[^0-9]]*\) [0-9].*/\1/'`
    elif [[ -r '/etc/arch-release' ]]; then
        n="Arch Linux"
    elif [[ -r '/etc/debian_version' ]]; then
        n='Debian'
    elif [[ -r '/etc/gentoo-release' ]]; then
        n='Gentoo'
    elif [[ -r '/etc/knoppix-version' ]]; then
        n='Knoppix'
    elif [[ -r '/etc/mandrake-release' ]]; then
        n='Mandrake'
    elif [[ -r '/etc/pardus-release' ]]; then
        n='Pardus'
    elif [[ -r '/etc/puppyversion' ]]; then
        n='Puppy Linux'
    elif [[ -r '/etc/redhat-release' ]]; then
        n='Red Hat'
    elif [[ -r '/etc/sabayon-release' ]]; then
        n='Sabayon'
    elif [[ -r '/etc/slackware-version' ]]; then
        n='Slackware'
    elif [[ -r '/etc/SuSE-release' ]]; then
        n='SuSE'
    elif [[ -r '/etc/xandros-desktop-version' ]]; then
        n='Xandros'
    elif [[ -r '/etc/zenwalk-version' ]]; then
        n="Zenwalk"
    fi
    [[ "${n:-}" = '' ]] &&  \echo "ERROR: Could not determine the distro name" >&2 && \exit 1
} # get_distro_name