An intrepid reader asked the following question:
How do you install a .dmg package from the command line?

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. To install the ROOT source you can download the tar file containing all the source files from the ROOT website. The first thing you should do is to get the latest version as a tar file. Unpack the source tar file, this creates directory ‘root’:% tar zxvf rootv5.30.xx.source.tar.gz.

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Installing OS X from a DMG file can be difficult. With leopard testing and development, many people are having troubles installing from the supplied binary. Here is how it can be accomplished. Installing OS X from a dmg file format instead of a DVD/CD format seems challenging. Here is how it can be accomplished. Release ROOT for Mac OS X via popular channels Package ROOT binary (dmg or tarball) against system software only Support Homebrew as semi-official channel (help the community) Consider help in supporting other channels, such as MacPorts Release a stable ROOT binary Avoid dependency on particular version of MS Visual Studio. Installing ROOT We’ll be installing ROOT in to the same directory that Homebrew installs things in to, but you can choose whichever directory you like (preferably one which your user owns to avoid lots of sudo). Create the directory and download ROOT in to it with cURL. xone k2 traktor mapping denon

Many applications are distributed as disk images, a compressed binary format. If you double click a disk image in the Finder, it is mounted automatically. Once mounted, installation of the application is typically done by dragging an icon to the Applications folder. The same can be accomplished from the command line using two commands, hdiutil and cp.

The following steps show the installation of a popular VNC client for OS X called 'Chicken of the VNC'. It can be used as a remote desktop client for Linux, Mac, or Windows hosts.

The download file is named 'cotvnc-20b4.dmg'. Here are the steps needed to install it remotely from the command line.
note: this technique can be used from a local Terminal window or a remote SSH connection.

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Mount the disk image

The first step is to mount (or attach) the disk image. From the command line, use:
hdiutil mount cotvnc-20b4.dmg
I received the following output:

A mounted disk image appears on the Desktop, in the Finder, and more importantly shows up as a directory in /Volumes. In this case, the last line of output from hdiutil showed exactly where the disk image was mounted.

Sometimes when a disk image is mounted, it will prompt you to agree to a license first. In that case, the text that would normally appear in a GUI dialog box instead appears in the Terminal window. Once you scroll to the bottom of the agreement, you can type in Y to continue or N to stop. The Firefox disk image is one example of a package that displays a license before mounting.

Install the application

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Use the cp command to copy the application to /Applications:
sudo cp -R '/Volumes/Chicken of the VNC/Chicken of the VNC.app' /Applications

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The -R switch means to copy recursively, in other words, copy everything from that location including all subdirectories and files below. It is important to leave off the trailing '/' from the 'Chicken of the VNC.app' directory, or the command will not copy the directory itself, just the contents. After entering your password, the application will be installed and ready to use.

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Most applications can simply be copied to the /Applications directory. However, some are distributed in a .pkg format and must be installed using the installer command instead of cp. To install a .pkg, use this command:
sudo installer -package /path/to/package -target '/Volumes/Macintosh HD'

Unmount the disk image

To tidy up, return to your home directory and unmount the disk image:
cd ~
hdiutil unmount '/Volumes/Chicken of the VNC/' Nesbeth my dream mp3 download.

You should see this message after the unmount:
'/Volumes/Chicken of the VNC/' unmounted successfully.

Installing applications from a .dmg package at the command line is not something you need to do every day. But it is a nice tool to have if you want to install an application on a remote server or script the installation of a package to a group of desktop Macs.