Get Hardware UUID in Mac OS X

ioreg -ad2 -c IOPlatformExpertDevice | xmllint --xpath '//key[.="IOPlatformUUID"]/following-sibling::*[1]/text()' -
Formats the output from `ioreg` into XML, then parses the XML with `xmllint`'s xpath feature.
Sample Output
08E4F05C-349D-4F23-8980-E2C3EA66DA2A

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