Reset your lost OS X password
May 20th, 2009
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You gotta hate it when you have a brain fart or lapse of memory and you forget your login 
information. Unfortunately OS’s don’t have the ‘Forgot Password?’ – click here link to reset or have your password emailed to you. Well, for the Mac there is a work around.
All you need is to remember your username (you do remember that, right?) and then reboot your computer. From there it’s command line work:
Hold Apple+S when booting to enter single user mode
#sh /etc/rc
#passwd yourusername
#reboot
The only major downside to resetting your password this way is that you’ll lose all keychain passwords, but if you’ve really forgotten your password, it’s better than nothing.