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# OS bit
# 32bit: i686
# 64bit: x86_64
function get_os_bit() {
    echo "$(uname -m)"
}

# Linux distribution名の取得
# debian,ubuntu:        debian
# redhat,fedora,centos: redhat
# gentoo,chromeos:      gentoo
# other:                unknown
function get_linux_distribution() {
    # Debian系
    if [ -e /etc/debian_version ] || [ -e /etc/debian_release ]; then
        distri_name="debian"
    # redhat系
    elif [ -e /etc/redhat-release ] || [ -e /etc/fedora-release ]; then
        distri_name="redhat"
    # Gentoo系
    elif [ -e /etc/gentoo-release ]; then
        distri_name="gentoo"
    # その他
    else
        distri_name="unknown"
    fi
    echo ${distri_name}
}

# OS名の取得
# mac,osx: mac
# linux: linux
# windows: cygwin
# other: unknown
function get_os() {
    get_uname="$(uname -s)"
    if [ ${get_uname} == "Darwin" ]; then
        os_name="mac"
    elif [ "$(expr substr ${get_uname} 1 5)" == "Linux" ]; then
        os_name="linux"
    elif [ "$(expr substr ${get_uname} 1 10)" == "MINGW32_NT" ]; then
        os_name="cygwin"
    else
        os_name="unknown"
    fi
    echo ${os_name}
}