Find the exact Build Number of a specific Mac OS X update from the command line

[myitrumors]

How do I find the System Build Number or I guess it is called just the Build Number (example 18A391 or 18G87 or 18G5033 or etc. etc.) for a specific Mac OS X updates? Not upgrade, just the regular updates. Examples: Supplemental or Security or Combo or Safari, etc. etc.



I am aware of thousands of blogs and websites that published those type of information's, but let's do a practical example:



Step #1 I download this specific dmg file (Security Update 2020-006 (Mojave)) from: https://support.apple.com/kb/DL2062?viewlocale=en_US&locale=en_US



Step #2 I mount the dmg file and I extract the pkg file.



Now, I do believe that the pkg file that I just extracted from the dmg file it is some sort of xar archive file, so my question is:



using the command line, how do I unzip the xar archive file and after I unzip the archive, what specific plist file I am looking for in order to find out the exact Build Number of this specific Security Update 2020-006 update?



Thank you

 

[nospamboz]

This worked for me.

pkgutil --expand SecUpd2020-006HighSierra.pkg Expanded
cd Expanded
cd SecUpd2020-006HighSierra.pkg
head -2 PackageInfo

There you will find:
identifier="com.apple.pkg.update.os.SecUpd2020-006HighSierra.17G14042"

17G14042 is the build number.

HTH

 

[myitrumors]

This worked for me.

pkgutil --expand SecUpd2020-006HighSierra.pkg Expanded
cd Expanded
cd SecUpd2020-006HighSierra.pkg
head -2 PackageInfo

There you will find:
identifier="com.apple.pkg.update.os.SecUpd2020-006HighSierra.17G14042"

17G14042 is the build number.

HTH

Perfect that did it. thank you so much