Terminal to disable startup chime

I want to stop the startup chime and the normal terminal script, (sudo nvram SystemAudioVolume = 80%) "does not work because of a password problem.

After you enter the script Terminal asks for my password. I provide the password and terminal says "command not found". Naturally, I assume that the password is incorrect, but it is the same password that opens the permissions and is used for the administrator account ID.

In fact, I created a new master password for the computer through Permission > File Vault. (File Vault is turned off). However, Terminal always reports "command not found". !

A Unix guru can tell me how to get rid of this annoying chime, perhaps including a reset command Admin password?

I use OS10.6.8. on iMac Intel

Startup Chime Disable

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