Mounts the DMG, then runs/installs the installer inside it, then cleans up

mount-dmg-install-cleanup.sh

#!/bin/bash

# Variables, dmgPath is where the DMG installer will be located and the packageName is the installer inside the DMG,
# usually it's someting like Install.pkg or Install.mpkg, you need to know what it is and supply it to "packageName" variable

# Update these variables based on the DMG/installer you will be using this script on
dmgPath="/Users/Shared/Application.dmg"
packageName="Install.pkg"

################################################################
# DO NOT TOUCH BELOW UNLESS YOU KNOW WHAT YOU ARE DOING! #######
################################################################

# Mount the DMG, and save its' device
device=$(/usr/bin/hdiutil attach -nobrowse "$dmgPath" | /usr/bin/grep "/Volumes" | /usr/bin/awk '{ print $1 }')
echo "device is: $device"

# Using the device, determine the mount point
mountPoint=$(/usr/bin/hdiutil info | /usr/bin/grep "^$device" | /usr/bin/cut -f 3)
echo "mountPoint is: $mountPoint"

# Point to pkg/mpkg
pkgToinstall="$mountPoint"/$packageName""
echo "pkgToinstall is: $pkgToinstall"

# Install the package
/usr/sbin/installer -verbose -pkg "$pkgToinstall" -target /

sleep 15

# Detach the volume and remove the DMG with installer
/usr/bin/hdiutil detach $device
rm -rf /Users/Shared/FortiClient_Installer.dmg

exit 0