macOS Compatibility Fun!

Compatibility Questions

If you work with Macs and Jamf then you know every year there’s a new per OS Extension Attribute (EA) or Smart Group (SG) recipe to determine if macOS will run on your fleets hardware. However I asked myself: What if a single Extension Attribute script could fill the need, requiring only a periodic updating of Model IDs and the addition of new macOSes?

Then I also asked: Could this same script be re-purposed to output both text and CSV, not just for the script’s running host but for a list of Model IDs? And the answer was a resounding yes on all fronts!

EA Answers

So, my fellow Jamf admin I present to you in its simplest form you just run the script and it will provide ultra-sparse EA output like: <result>10.14 10.15 11</result> this could then be used as a Smart Group criteria. Something like “macOS Catalina Compatible” would then match all Macs using LIKE 10.15 or “Big Sur Incompatible” would use NOT LIKE 11, of course care would be taken if you were also testing for 10.11 compatibility, however the versionsToCheck variable in the script can limit the default range to something useful and speeds things up the less version there are. I hope this helps Jamf admins who have vast unwieldy fleets where hardware can vary wildly across regions or departments,

CSV Answers

Now if you provide a couple arguments like so: ./ -c -v ALL ALL > ~/Desktop/macOSCompatibilityMatrix.csv you will get a pretty spiffy CSV that let’s you visualize which Mac models over the years have enjoyed the most and least macOS compatibility. This is my favorite mode, you can use it to assess the OS coverage of past Macs.

See macOSCompatibilityMatrix.csv for an example of the output. If you bring that CSV into Numbers or Excel you can surely liven it up with some Conditional Formatting! This is the barest of examples:

Can you spot the worst and best values?

Text Answers

If you don’t use the -c flag then it’ll just output in plain or text, like so: ./ -v ALL ALL

iMacPro1,1: 10.13 10.14 10.15 11
MacBook1,1: 10.4 10.5 10.6
MacBook2,1: 10.4 10.5 10.6 10.7
MacBook3,1: 10.5 10.6 10.7
MacBook4,1: 10.5 10.6 10.7
MacBook5,1: 10.5 10.6 10.7 10.8 10.9 10.10 10.11
MacBook6,1: 10.6 10.7 10.8 10.9 10.10 10.11 10.12 10.13
MacBook7,1: 10.6 10.7 10.8 10.9 10.10 10.11 10.12 10.13
MacBook8,1: 10.10 10.11 10.12 10.13 10.14 10.15 11
MacBook9,1: 10.11 10.12 10.13 10.14 10.15 11
MacBook10,1: 10.12 10.13 10.14 10.15 11
MacBookAir1,1: 10.5 10.6 10.7
MacBookAir2,1: 10.5 10.6 10.7 10.8 10.9 10.10 10.11

Wrapping Up

Now, it’s not totally perfect since some models shared Model IDs (2012 Retina and Non-Retina MacBook Pros for example) but for the most part the Intel Mac Model IDs were sane compared to the PPC hardware Model IDs: abrupt jumps, overlaps, and re-use across model familes. Blech! I’m glad Apple “got religion” for Model IDs (for the most part) when Intel CPUs came along. I did attempt to go back to 10.1-10.3 with PPC hardware but it was such a mess it wasn’t worth it. However testing Intel, Apple Silicon and VMs against macOS 10.4 – 11+ seems to have some real use and perhaps you think so too? Thanks for reading!

KB Shortcut: Show Original(ity)

I hear it all the time (once): “Hey Joel! Your posts are fun and all… but what about me, the average every-man, who’s not a Mac admin?” Well, I hear you. Today, I have a Keyboard shortcut tip! Everyone loves those right? Tips like these are what some Mac blogs use to keep those daily click-thru revenues humming along! Here we go!

Aliases. Ever use those? You know, the files with the little arrows on them. The ones that have ruined many a off-site client presentation: “What do you mean ‘the original item can’t be found’?!!?! Fuuuuu…..!” Yeah, those.

An alias in the wild

Back in the “old days” (aka last year) and for decades before that (1991!), the keyboard shortcut in Finder to “Show Original” was Command-R, in fact that’s what Apple still says it is!

Command-R since 1991 meant “Show Original” aka “Reveal in Finder”

Since nothing lasts forever, it changed. Starting last year with macOS Mojave, “Show Original” is now the finger twisting Command-Option-Control-A. Why? So Command-R and Command-L could rotate your photos in Finder and QuickLook, that’s why!

See what they did there?

Daring Fireball has a great write-up screed about this, it’s hilarious and I love it, but my only critique is: not enough pictures! Well, I’m here to help, folks. Let’s figure out how to contort our hand to “Show Original” in this brave new world.

I’m trying to stay away from the “OK” sign these days…
This one is just a traffic-jam of fingers
Two handed? Has it really come to this? I need my mouse hand!

After some finger yoga and mindfulness exercises, I think I’ve come upon a way to Show Original, in a way that’s functional (one handed) and makes a statement! Here it is.

There we go! That sums it up.

Disclaimer: I am not responsible for any hand cramps or workplace misunderstandings that may arise from the use of this keyboard shortcut.