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I'm using Mac OS X Lion 10.7.3 desktop. I don't know my sudo password so I'm unable to do sudo operations.

How do I find my password or change it?

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In System Preferences, select Users & Groups, then change password on your user.

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ThankU for the answer. Finally I did it. I created a password for my account and from "su" command, i changed the permissions of the root file and edited it. I got the result what i want. – Sesank Kanuparthi Feb 13 '13 at 5:31

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