An intrepid reader asked the following question:
How do you install a .dmg package from the command line?
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
.![Dmg Shell Dmg Shell](/uploads/1/2/4/8/124897973/922407593.jpg)
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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.
note: this technique can be used from a local Terminal window or a remote SSH connection.
Mount the disk image
The first step is to mount (or attach) the disk image. From the command line, use:
I received the following output:
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.
Dmg-o1 Shell Raspberry Pi
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
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. 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'
Os X Dmg Shell
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/'
![Shallotte Shallotte](/uploads/1/2/4/8/124897973/829506617.jpg)
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.
Actually, there's more to consider:
If the disk image is on the desktop, either approach in my earlier post will get it off the desktop, but in different ways.
If 'eject' is used, then the disk identifier associated with the disk image is lost, as there is no longer a disk image (mounted or unmounted). In this case, to get the disk image again, you will have to open the related .dmg file.
But if 'hdiutil unmount' is used the disk image is simply unmounted and retains a disk identifier -- and you should be able to remount it with appropriate code.
I think detach and attach are synonymous with unmount and mount, but check man hdiutil.
The disk identifiers can be found in do shell script 'hdiutil info'. You can 'coerce' the disk image name to a disk identifier with a bit of code, and that allows you to repeatedly mount and unmount the disk image with:
tell app 'Terminal' to do script 'hdiutil (un)mount diskXXX'
But once you 'eject' the disk image, there will be no disk identifier.
If the disk image is on the desktop, either approach in my earlier post will get it off the desktop, but in different ways.
If 'eject' is used, then the disk identifier associated with the disk image is lost, as there is no longer a disk image (mounted or unmounted). In this case, to get the disk image again, you will have to open the related .dmg file.
But if 'hdiutil unmount' is used the disk image is simply unmounted and retains a disk identifier -- and you should be able to remount it with appropriate code.
I think detach and attach are synonymous with unmount and mount, but check man hdiutil.
The disk identifiers can be found in do shell script 'hdiutil info'. You can 'coerce' the disk image name to a disk identifier with a bit of code, and that allows you to repeatedly mount and unmount the disk image with:
tell app 'Terminal' to do script 'hdiutil (un)mount diskXXX'
But once you 'eject' the disk image, there will be no disk identifier.