Bugreport: core-tutorial example outdated?

Hi there!

I just studied
http://www.kernel.org/pub/software/scm/git/docs/core-tutorial.html
to get more into the details of git. But the following commands:

$ git-cat-file -t 557db03de997c86a4a028e1ebd3a1ceb225be238
$ git-cat-file "blob" 557db03

just bring up a

fatal: Not a valid object name 557db03de

I guess the documentation is slightly outdated and might need a fix.

Best greets,
-- 
Clemens Koller
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