Forgot admin password on mac

MacOS - Change the admin password (no installation disk)


In this tip you will learn how to change or reset the Mac admin password without the installation disk. This solution implies the the creation a new account on the Mac OS X!
Procedure:

The solution is to create a new admin by deleting a specific file.
You need to enter terminal and create a new admin account:
1. Reboot
2. Hold Apple +S down after you hear the chime (Command + S on new models).
3. When you get text prompt, enter these terminal commands to create a new admin account (hitting return after each line):
mount -uw /
rm /var/db/.AppleSetupDone
shutdown -h now
4. After rebooting you should have a brand new admin account.
5. Log-in and delete the previous admin account!


will this delete all my files and pictures????