![]() ![]() Note that in this output we’re missing the exact OS build version – 16G29 in this case for 10.12.6. It’s possible using just the Finder and Quick Look, even. We can quickly glean this without needing to mount anything or access any hidden files. At this point, I may need to be in a terminal window, because BaseSystem.dmg has the hidden file flag, and the Finder may not be showing hidden files unless we’ve already set defaults write -bool AppleShowAllFiles true, so this is simply easier. Previously I used to navigate to Contents/SharedSupport/InstallESD.dmg, double-click to mount it, then mount BaseSystem.dmg to get at the System/Library/CoreServices/ist file within that. $ /usr/libexec/PlistBuddy -c 'Print :System\ Image\ Info:version' '/Applications/Install macOS Sierra.app/Contents/SharedSupport/ist' For example, to look at the version for the Sierra installer: New in macOS Sierra and up (at the time of writing, High Sierra beta 4), there’s an ist file located alongside the InstallESD.dmg image in the SharedSupport directory, which seems to contain this info. I also often find myself looking at an installer app on some system, somewhere, and I just want to know what version it is. The CDN propogation delays for the installers seem to have improved recently, but generally one still always wants to confirm that they’ve downloaded a newly-released version. There’s no obvious way to tell, just from looking at the installer app, what OS version you’ve actually downloaded if you’re getting it right at the time of release (or ever, for that matter). It’s often happened that CDNs take up to a few hours to offer the newer macOS installer, even when the App Store HTML tends to update to the latest version immediately after Apple releases the updates to their Software Update catalogs. The 2nd component in the version info above happened to match the minor OS version in later Sierra installers, but not this one. ![]() 'Get Info' dialog for the Sierra 10.12.3 installer.
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