命令：xcrun、xcodebuild

xcrun -h 显示如下：

xxx@xxxMacBook-Pro ~ % xcrun -h
Usage: xcrun [options]  ... arguments ...

Find and execute the named command line tool from the active developer
directory.

The active developer directory can be set using `xcode-select`, or via the
DEVELOPER_DIR environment variable. See the xcrun and xcode-select manual
pages for more information.

Options:
  -h, --help                  show this help message and exit
  --version                   show the xcrun version
  -v, --verbose               show verbose logging output
  --sdk             find the tool for the given SDK name
  --toolchain           find the tool for the given toolchain
  -l, --log                   show commands to be executed (with --run)
  -f, --find                  only find and print the tool path
  -r, --run                   find and execute the tool (the default behavior)
  -n, --no-cache              do not use the lookup cache
  -k, --kill-cache            invalidate all existing cache entries
  --show-sdk-path             show selected SDK install path
  --show-sdk-version          show selected SDK version
  --show-sdk-build-version    show selected SDK build version
  --show-sdk-platform-path    show selected SDK platform path
  --show-sdk-platform-version show selected SDK platform version

xcodebuild -showsdks 显示支持的所有SDK及版本号：

xxx@xxxMacBook-Pro ~ % xcodebuild -showsdks
iOS SDKs:
	iOS 15.0                      	-sdk iphoneos15.0

iOS Simulator SDKs:
	Simulator - iOS 15.0          	-sdk iphonesimulator15.0

macOS SDKs:
	DriverKit 20.4                	-sdk driverkit.macosx20.4
	macOS 11.3                    	-sdk macosx11.3

tvOS SDKs:
	tvOS 15.0                     	-sdk appletvos15.0

tvOS Simulator SDKs:
	Simulator - tvOS 15.0         	-sdk appletvsimulator15.0

watchOS SDKs:
	watchOS 8.0                   	-sdk watchos8.0

watchOS Simulator SDKs:
	Simulator - watchOS 8.0       	-sdk watchsimulator8.0

xcodebuild 命令选项较多，可根据xcodebuild -h进行查看