gistfile1.txt

Paulos-MacBook-Pro:~ paulo$ cat /Volumes/Macintosh\ HD/System/Library/CoreServices/SystemVersion.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>ProductBuildVersion</key>
	<string>15F34</string>
	<key>ProductCopyright</key>
	<string>1983-2016 Apple Inc.</string>
	<key>ProductName</key>
	<string>Mac OS X</string>
	<key>ProductUserVisibleVersion</key>
	<string>10.11.5</string>
	<key>ProductVersion</key>
	<string>10.11.5</string>
</dict>
</plist>
Paulos-MacBook-Pro:~ paulo$ sudo systemsetup -setstartupdisk /Volumes/Macintosh\ HD
Not a System Folder: /Volumes/Macintosh HD/System/Library/CoreServices
Paulos-MacBook-Pro:~ paulo$ sudo systemsetup -liststartupdisks
/System/Library/CoreServices
Paulos-MacBook-Pro:~ paulo$