Several ways for Nexus One to obtain root permissions

I did a Nexus One-based research at the company yesterday and found that many commands are not usable. The prompt is: Permission denied. Because I was just engaged in Android development, I checked the information and found that the root permission of the mobile phone must be obtained. I have seen several methods on the Internet to obtain the Nexus One root permission, which may not be complete, but let's sum up.

 

1. Install an Android version that has the root permission.
2. Install an app called Quick Rooter. However, no relevant information can be found on the Internet.
3. With the ADB and fastboot tools, you can easily obtain the root permission of Nexus One. (I use this method.

The above is just a simple list of several methods. I just used the third method to achieve the goal of obtaining root permissions, but the specific principle is not very clear. If anyone is familiar with this aspect, for more information, see the following link.

 

1 and 2 methods related web site: http://www.addictivetips.com/mobile/root-nexus-one-running-android-2-2/

3 methods related web site: http://theunlockr.com/2010/01/02/how-to-root-the-nexus-one/

In addition, this is the website of cyanogen, a lot of knowledge about Android firmware/root and how to crack it.

Http://wiki.cyanogenmod.com/index.php? Title = main_page