$ for pkg in /Applications/Xcode.app/Contents/Resources/Packages/*.pkg; do
> sudo installer -pkg "$pkg" -target /;
> done
example:
$ ls -altrh /Applications/Xcode.app/Contents/Resources/Packages/
total 180512
-rw-r--r-- 1 root wheel 87K Mar 10 2017 MobileDeviceDevelopment.pkg
-rw-r--r-- 1 root wheel 5.4M Sep 30 05:28 XcodeSystemResources.pkg
-rw-r--r-- 1 root wheel 11K Sep 30 05:28 XcodeExtensionSupport.pkg
-rw-r--r-- 1 root wheel 83M Sep 30 05:28 MobileDevice.pkg
drwxr-xr-x 6 root wheel 204B Oct 11 05:23 ./
drwxr-xr-x 87 root wheel 2.9K Oct 11 05:55 ../
$ for pkg in /Applications/Xcode.app/Contents/Resources/Packages/*.pkg; do
-> sudo installer -pkg "$pkg" -target /;
-> done
installer: Package name is MobileDevice
installer: Upgrading at base path /
installer: The upgrade was successful.
installer: Package name is MobileDeviceDevelopment
installer: Installing at base path /
installer: The install was successful.
installer: Package name is XcodeExtensionSupport
installer: Installing at base path /
installer: The install was successful.
installer: Package name is XcodeSystemResources
installer: Installing at base path /
installer: The install was successful.
$ open "/System/Library/CoreServices/Software Update.app"
$ open "/System/Library/CoreServices/Software Update.app/Contents/Resources/softwareupdated"
SoftwareUpdateNotificationManager
$ open /System/Library/PrivateFrameworks/SoftwareUpdate.framework/Versions/A/Resources/SoftwareUpdateNotificationManager.app
$ open /System/Library/PrivateFrameworks/SoftwareUpdate.framework/Versions/A/Resources/SoftwareUpdateNotificationManager.app/Contents/MacOS/SoftwareUpdateNotificationManager