Detect debian operating system

debian_os_meta.sh

#!/bin/bash

# Try and get debian operating system
# id, codename, and release 
get_debian_os_meta() {
    OS=$(uname)
    ID="unknown"
    CODENAME="unknown"
    RELEASE="unknown"

    if [ "$OS" == "Linux" ]; then
        # could be debian or ubuntu
        if [ $(which lsb_release) ]; then
            ID=$(lsb_release -i | cut -f2)
            CODENAME=$(lsb_release -c | cut -f2)
            RELEASE=$(lsb_release -r | cut -f2)
        elif [ -f "/etc/lsb-release" ]; then
            ID=$(cat /etc/lsb-release | grep DISTRIB_ID | cut -d "=" -f2)
            CODENAME=$(cat /etc/lsb-release | grep DISTRIB_CODENAME | cut -d "=" -f2)
            RELEASE=$(cat /etc/lsb-release | grep DISTRIB_RELEASE | cut -d "=" -f2)
        elif [ -f "/etc/issue" ]; then
            ID=$(head -1 /etc/issue | cut -d " " -f1)
            if [ -f "/etc/debian_version" ]; then
              RELEASE=$(</etc/debian_version)
            else
              RELEASE=$(head -1 /etc/issue | cut -d " " -f2)
            fi
        fi
    fi

    # lower case the names in a solid way
    # can't assume bash 4.0 syntax
    ID=$(echo "$ID" | tr '[A-Z]' '[a-z]')
    CODENAME=$(echo "$CODENAME" | tr '[A-Z]' '[a-z]')
    RELEASE=$(echo "$RELEASE" | tr '[A-Z]' '[a-z]')

    echo -e "ID\t$ID"
    echo -e "CODENAME\t$CODENAME"
    echo -e "RELEASE\t$RELEASE"
}
get_debian_os_meta