how to silently install .dmg in MacOS?

I have a .dmg MacOS package (with 'continue' buttons, EULA etc) that i need to install on multiple computers. Is it a way to do so silently via a bash/python/ruby/etc script just like silent MSI installation in Windows? I can automate installation writing script that will click buttons for me, but that looks kinda unnatural :).

to instal a DMG you can do this:

cd ~/Desktop

curl -O http://darwinports.opendarwin.org/downloads/DarwinPorts-1.2-10.4.dmg

hdiutil attach DarwinPorts-1.2-10.4.dmg

cd /Volumes/DarwinPorts-1.2/

sudo installer -pkg DarwinPorts-1.2.pkg -target "/"

hdiutil detach /Volumes/DarwinPorts-1.2/

In a nutshell, this

1. goes to your Desktop folder
2. grabs DarwinPorts from the opendarwin site
3. mounts the dmg
4. goes to the newly mounted DarwinPorts volume
5. installs the package, targeted to the root, as the root user
6. ejects the mounted disc image.

you then can use Automator to do this...

code taken from this page

If you're administrating multiple Macs, I highly recommend investing in a copy of ARD - I'm sure there is a scripting answer to your question, but I've been using ARD for so long, I'm afraid I don't know it!