To be precise, this is a shell script. The full and fun description for hdutil is on ADC website.
hdutil
Name: Takaaki Kato
An unemployed jackass. Hunting for a job.
Available for hire. お仕事探し中。
Contact: (kontakt) [at] samuraicoder (dot) [net]
(kontakt) [at] samuraicoder (dot) [net]
Interests: Ruby on Rails, PHP, Mac and TextMate.
Shop at Amazon.com or try Backpack to support this website. Shopt at Amazon Japan if you reside in Japan. Donation is also welcome.