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Okay, that partiucular error message hints that your shell isn't finding the mysqladmin command.

Can you do
cd /Applications/MAMP/bin/mysql4/bin
ls

... and make sure that you're in the right place and mysqladmin is present?

(you could instead add /Applications/MAMP/bin/mysql4/bin to your $PATH for convenience)
 
Sorry, missed this one. If you haven't found the answer already, you can use that command line in the instructions as is (but it will probably be ./mysql and so on). The nuke.sql file can be anywhere you want it to be. Instead of the <nuke.php in the example, you can use < /Users/iMeowbot/junk/nuke.php (or whatever the full path the the actual file is).
 
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