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I'm automating my Mac installation using puppet. As a part of it I need to install several programs that come in a .dmg format.

I use the following to mount them:

sudo /usr/bin/hdiutil mount -plist -nobrowse -readonly -quiet -mountrandom /tmp Program.dmg

The problem is that some .dmg files come with a license attached, and so script is stuck accepting the license. (There is no stdin/out when running with puppet, so I can't manually approve it to continue.)

Is there a way to pre-approve or force-approve the license?

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Could possibly go on SF; you're dealing with issues that arise from working with many machines. However, it could also go here. – Kevin M Dec 25 '10 at 21:10
Do "yes | hdiutil attach disk.dmg > /dev/null" - that'll type a 'Y' for you. – mauvedeity Oct 8 '11 at 11:35
up vote 3 down vote accepted

If you have a GUI and are able to perform two command-line calls in parallel, you can use

/System/Library/CoreServices/ /path/to/file.dmg


osascript accept.scpt

the latter of which executes the following AppleScript:

tell application "System Events"
    delay 5 # wait 5 seconds -- I tested it using two terminal tabs and needed the time
    key code 48 # press tab 4 times in the license window
    key code 48
    key code 48
    key code 48
    keystroke " " # press space to click "accept"
end tell

In bash, I'm able to write

/System/Library/CoreServices/ file.dmg & osascript accept.scpt
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I forgot to mention that I don't use puppet. This answer might therefore be terribly useless, but since it's been a few days, I posted anyway. – Daniel Beck Dec 25 '10 at 21:14
hmm I get an error when trying to run osascript accept.scpt ➜ dotfiles git:(master) ✗ osascript accept.scpt osascript: accept.scpt: No such file or directory – grant May 26 '15 at 19:13
@grant You have to create the file with the specified content first. – Daniel Beck May 26 '15 at 19:33

This worked for me when I encountered a .dmg that contained a EULA which I wanted to install it via the command line with no user interaction...

/usr/bin/hdiutil convert -quiet foo.dmg -format UDTO -o bar
/usr/bin/hdiutil attach -quiet -nobrowse -noverify -noautoopen -mountpoint right_here bar.cdr

(note: I am reasonably sure not all of the above options are needed to bypass the EULA, such as -nobrowse, -noverify, -noautoopen, -mountpoint. However, I used them and I didn't test without them so I didn't want to claim something that I hadn't tested.)

What I ended up with was a directory with


where right_here/ contained the contents of the foo.dmg without being prompted for the EULA.

Be sure to detach when you are done!

/usr/bin/hdiutil detach right_here/

For more information: hdiutil(1) Mac OS X Manual Page.


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This solution was perfect, thanks! – neu242 Jul 17 '12 at 20:05
Thanks -- this worked well with a multi-page agreement, where a repeated 'y' didn't work. – Lars Rohrbach Sep 17 '12 at 22:14

If it just needs "Y" typed in, then pipe the yes command into the hdiutil command:

yes | /bin/hdiutil [...]

That will emulate pressing 'y' and return at the command line.

To type something else, just put it on the command line as a parameter:

yes accept | ...

That'll enter 'accept' into the script.

Note that if the script asks for input multiple times, the yes command will put multiple entries in. You may see output like 'broken pipe' - this just means that the command you piped into quit while 'yes' was still sending input.

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I've never tried this, so I didn't know about the stout redirect. Thanks for the +50! – mauvedeity Oct 10 '11 at 22:26

I recently came across a DMG that had a EULA and it was really irritating me since I couldn't script around it. I figured out if I converted the DMG to a CDR it bypassed the EULA on mounting the CDR.

Here's what I did:

hdiutil convert foo.dmg -format UDTO -o bar.cdr
hdiutil attach bar.cdr
rm foo.dmg <--optional

Hope this helps.

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This helped me a ton! The yes | hdiutil... solutions would hang for me when called from a python script for some crazy reason. – Nathan Apr 16 '15 at 3:37

Shouldn't you be using puppet's own tools to install packages? I'm a radmind admin myself and I'm not familiar with puppet, but a check on their wiki reveals that there is a tool called pkgdmg that might do the equivalent of what you're trying to accomplish.

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it doesn't handle apps that require accepting license. – Vitaly Kushner Feb 3 '11 at 19:39
Indeed; I was under the impression that you would be creating your own packages with no need for a license acceptance. Such is the mindset of a Radmind admin, I suppose. – NReilingh Feb 3 '11 at 22:51

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