Installing create-dmg via Homebrew on macOS 10.5 fails with 'cmd not found' error

Homebrew can be a can of worms for the uninitiated and especially on unsupported platforms (e.g. Monterey and older). You might be better served to purchase a macOS Leopard 10.5.6 DVD and save yourself considerable wasted time with your current approach.

It has been a decade since I tried to make a bootable image of those old DVD installers (I think it was for 10.6). I think you can use Disk Utility to do so, but Disk Utility is not a great app for doing this. I never tried using CCC to make a bootable clone of a macOS installer DVD to a DMG archive.

BeenHackedAgainuuyt wrote:

the cmd's for instaling create-dmg dont work i keep getting a cmd not found for shbrew the first operation to install create-dmg.

For one, you need a space between "sh" and "brew". It would really help if you provided links to the utilities & formulas involved in addition to knowing your exact version of macOS being used with Homebrew.

And for you to post a screenshot of the Terminal window showing the actual command used and its output. You can also copy & paste that information from the Terminal window into the text editing window making sure to use the "Code Insertion" tool whose icon looks like a "</>" on the forum editing tool bar so that the code snippet is easier to read.

I'm obviously new to the cmd line and trying to learn as I go using google-U, I can't understand why I'm getting this error,

I highly recommend you review the basics of using the command line here:

https://scriptingosx.com/2017/07/first-steps-in-terminal/

FYI, you must be extremely careful when using the command line since there are absolutely no safety nets. I certainly hope you have a good backup. With the command line even a simple typographical error can have catastrophic results such as accidentally deleting all of your data on the drive. This mistakes can even happen to people with decades of command line experience. Plus you should always understand commands you are using....at least well enough to have a general idea what they will do. Do not trust what someone has posted since many times commands may be for a very specific instance which may not apply to you....or the command may need to be modified for your situation.

If not if someone could point me toward something that I can use to burn a .iso file to disc while controling the size and shrinking it down while still keeping it looking enough like the origional that an old mac running 10.5 will recognize it. thanks

Are you trying to create a DMG or ISO image of an existing OSX installer DVD as well?

Or do you already have a DMG or ISO image of such a DVD and just need to burn it to DVD?

Usually when you burn an ISO image to a disk, it will utilize the entire disc/disk whether CD/DVD or USB. At least with a USB stick it may be possible to use specialized utilities to attempt to use the space after the "burned" image (not sure if that is possible with any macOS utilities....I have done so using Linux though).

Is this for booting a PPC Mac or an Intel Mac?

Are you trying to clone the MacOS installer disk?

More importantly, are you expecting this installer to work, after the fact?

If so, I can tell you now to stop wasting your time.

There is no utility in the world that can cram 7.9GB of MacOS Installer data (which is already compressed) onto a 4.7GB disc. You might be able to split the data across two discs, but it won't be functional in that way since the Installer app expects all the data to be on the same volume.

If, on the other hand, you're just looking to back up your MacOS 10.5 system, there are better options available.

Assuming that you - as you indicate - have Homebrew installed correctly, the general way to use it is to open your Terminal and use the command:

brew

followed by whatever parameters or sub-commands are needed. So for example:

brew info create-dmg

will print out a bunch of info about that package.

brew home create-dmg

Will take you to the homepage of the project responsible for that package

brew install create-dmg

will install it into the standard Homebrew Cellar location on your system.

However, none of that will allow you to put a 7.9 GB DMG into a 4.7GB DVD. You might - might - be able to get away with it with a double-layer 8.5GB DVD...but you would be far better off trying to use a 16GB USB flash drive.

I have in the distant past used Disk Utility to make bootable backup DVDs and disk images from Panther and Snow Leopard era optical disks but it was clumsy and succeeded only by trial and error, and current Disk Utility might not behave as it used to do back then.