Various ways to install packages on OSX

auto_install_dmg.sh

#!/bin/bash
# 
# Install an application or library that uses a PKG installer
# wrapped inside a DMG archive. Takes the URL of the DMG and
# optionally the name of the downloaded file locally.
#
#   ./auto_install_dmg.sh https://example.com/software/download/super_genius_tool_v1.2.dmg
set -uxe

download_url=${1:-"https://google.com/"}
package_name=${2:-"downloaded_package.dmg"}

download_dir=$(mktemp -d)
filename=${download_dir}/${package_name}

echo "Installing ${package_name}"

curl -fo ${filename} ${download_url}
pushd ${download_dir}

volume_name=$(hdiutil attach ${package_name} | grep '/Volumes' | awk '{$1=$2=""; print $0}')
volume_name=$(set -f; echo $volume_name)

packages=$(ls "${volume_name}"/*.pkg)
sudo installer -pkg "${packages}" -target /

hdiutil detach "${volume_name}"
popd

rm -f ${filename}

python_on_osx.sh

#!/bin/bash
#
# Install a specific Python version using the official
# python.org site using the commandline. This installer
# script takes an optional version number to install the
# desired version.
#
#   ./python_on_osx.sh 3.4.0
set -uxe

python_version=${1:-"3.5.2"}
package_name="python-${python_version}-macosx10.6.pkg"

filename=$(mktemp -d -t python)/${package_name}

echo "Installing version: ${python_version}"

curl -fo ${filename} https://www.python.org/ftp/python/${python_version}/${package_name}

sudo installer -pkg ${filename} -target /