Find out iOS SDK version from IPA

Recently I updated xcode on our CI server and additionally provide the option to use older xcode versions per project.
To verify that the option works I wanted to find out the iOS SDK version from the provided ipa.

Here we go:
Assuming the app is named APPNAME and the ipa my-app.ipa.

1. rename my-app.ipa to my-app.ipa.zip
2. unzip my-app.ipa.zip (Now we’ve got a folder named Payload)
3. execute the following bash command:
   otool -l Payload/APPNAME.app/APPNAME | fgrep --after-context=3 LC_VERSION_MIN_IPHONEOS
4. (Alternative)
   plutil -p Payload/APPNAME.app/Info.plist | grep DTSDKName

The output is something similar to:

cmd LC_VERSION_MIN_IPHONEOS
cmdsize 16
version 7.0
sdk 8.4
--
cmd LC_VERSION_MIN_IPHONEOS
cmdsize 16
version 7.0
sdk 8.4