For those of you who have been use to one clicks abut do not want to wait for a one click or just want to get refreshed on adb to unlock your nexus Im posting some snippets that I found on the web.
^the above is the Nexus S (this is just meant to get you up to speed what is going on)
II. Setup ADB
1. Head to our How To Setup ADB procedure, once you can see your phone’s serial number after typing adb devices then come back to this procedure and continue.
(MAKE SURE YOU FOLLOW ALL THE STEPS IN THE WRITTEN PROCEDURE AS THERE HAVE BEEN UPDATES ADDED).
III. Unlock the Bootloader
1. Turn off [COLOR=#00c800 !important][COLOR=#00c800 !important]your [COLOR=#00c800 !important]phone[/COLOR][/COLOR][/COLOR].
2. Turn it on by holding Volume Up and Power until fastboot mode comes up.
3. Plug the phone in via USB cable to your computer while it is in fastboot mode.
4. Open a command prompt on your computer by clicking on the Start [COLOR=#00c800 !important][COLOR=#00c800 !important]menu[/COLOR][/COLOR] button and typing cmd and hitting enter in the search box.
5. In the command prompt that pops up, type the following with hitting enter at the end of each line:
[COLOR=#00c800 !important][COLOR=#00c800 !important]cd[/COLOR][/COLOR] c:\androidsdk\tools\
fastboot oem unlock
6. At this point the phone will ask you to confirm, select yes. You now have an unlocked [COLOR=#00c800 !important][COLOR=#00c800 !important]bootloader[/COLOR][/COLOR].
IV. Flash a Custom Recovery Image
1. Download the custom recovery image and save it to your computer:
ClockworkMod Recovery for Nexus S
2. Copy the recovery.img file inside the tools folder of the sdk (so it is in the same folder as fastboot.exe)
3. Then in the command prompt that should still be open, type the following with hitting enter at the end of each line:
fastboot flash recovery recovery.img
4. Once it is flashed, leave the phone in plugged in and in fastboot mode.
V. Root the Phone
1. In fastboot mode, select Recovery using the volume buttons and power button and wait for it to boot into recovery mode.
2. Download the Superuser flashable [COLOR=#00c800 !important][COLOR=#00c800 !important]zip [COLOR=#00c800 !important]file[/COLOR][/COLOR][/COLOR] and save it to your computer.
Superuser for Android 2.0 and Up Flashable Zip
3. Once in [COLOR=#00c800 !important][COLOR=#00C800 ! important]recovery [COLOR=#00C800 ! important]mode[/COLOR][/COLOR][/COLOR], select Mounts and Storage then select Mount USB Storage so we can transfer files to the sd while it is in recovery mode.
4. Copy the Superuser.zip file to the root of your internal storage (do NOT extract it, do NOT put it in any folders, just on the phone’s storage itself).
5. Select Unmount on the phone.
6. Select Mount System, then select Go Back to get back to the main menu.
7. Then scroll to flash zip from [COLOR=#00c800 !important][COLOR=#00c800 !important]sdcard[/COLOR][/COLOR] and then choose zip from sd card and select the superuser.zip file and wait for it to finish flashing.
8. Once it is done, select Go Back then Reboot System and wait for the phone to [COLOR=#00c800 !important][COLOR=#00c800 !important]reboot[/COLOR][/COLOR].
VI. Stop the Phone from Uninstalling the Custom Recovery Image
1. Once the phone is booted up, plug it in via USB cable and do NOT mount the storage.
2. Open a command prompt on the computer and type the following with hitting enter at the end of each line:
mount -o rw,remount /dev/block/mtdblock3 /system
mv install-recovery.sh install-recovery-no.sh
3. That will mount the system as writable and rename the file that overwrites the recovery image on reboot so that our custom recovery will stay.
4. Turn off the phone and turn it back on by holding down Volume Up and Power to get into fastboot mode.
5. Plug the phone in via USB cable while in fastboot mode and open the command prompt again and type the following with hitting enter at the end of each line:
adb reboot bootloader
fastboot flash recovery recovery.img
5. Once it is done, you have just reflashed the recovery image and it will now stick. You are all done! You have an unlocked bootloader, a custom recovery image, and root access! If you want to now load a [COLOR=#00c800 !important][COLOR=#00C800 ! important]custom [COLOR=#00C800 ! important]ROM[/COLOR][/COLOR][/COLOR] head to the next procedure linked below.
(from: How to: Unlock the Galaxy Nexus Bootloader – Droid Life: A Droid Community Blog)
How to: Unlock the Galaxy Nexus Bootloader
by: Kellex | posted 12.05.11 | Galaxy Nexus, News, Root
Galaxy Nexus on Verizon, and I’m sure that many are starting to think about this whole bootloader unlocking process. As a Nexus device, the bootloader does not have to be bypassed or hacked like you have probably had to do to your last couple of phones. It’s a developer device that is made to be open. You can unlock your G-Nex within a couple of minutes as long as you have all of the right tools in place.
To get you prepared, we have put together a set of instructions that should cover the whole process. The big trick here is to get the Android SDK installed and to have it recognize your device through adb. Once you have done that, you should be able to unlock your phone with 2 simple commands and a quick volume press on the device.
And we are telling you about this now, because unlocking the bootloader of your Nexus should be step 1 before you get into customizing it to your like, downloading your favorite apps, etc. Unlocking the bootloader wipes your phone clean, so you will want to take care of this step from the get-go instead of having to start over on your phone down the road. Once your phone is unlocked, you won’t have to worry about unlocking it ever again.
So your homework until the phone arrives, is to check out the first 7 steps that we have below to get your Windows computer all set up for adb through the SDK. If you can get your phone to reboot to the bootloader by typing “adb reboot bootloader” then you should be all set. Your current Android phone should work just fine in getting this all set up.
*Windows only.1. Most important piece to this, is getting the Android SDK set up properly. [Instructions]
This can be one of the most difficult things to get set up, however, you cannot go forward without the SDK and adb set up and working. The instructions we linked should get you setup. Once the SDK is installed, you can move on to step 2.2. Place a fastboot.exe file in your SDK/Tools (or Platform-Tools) folder (same as your adb.exe file) if it is not there already. [Download]
*You may also need to move AdbWinApi.dll into the same folder as your adb.exe and fastboot.exe if you are running into issues. I believe in the latest SDK, that everything defaults to SDK/Platform-Tools rather than SDK/Tools. Just depends on the version you are using. The big thing, is to get adb.exe, fastboot.exe, and AdbWinApi.dll into the same folder.3. On your device, turn USB Debugging on.
5. On your computer, head into your SDK/Tools folder or wherever your adb.exe and fastboot.exe files are.
6. Hold SHIFT and right click – choose “Open command window here.”
adb reboot bootloader8. Your phone will turn off and reboot to the bootloader.
fastboot oem unlock10. Your phone will then ask if you want to unlock.
12. Your bootloader will now be unlocked.
14. You are now operating with an unlocked Galaxy Nexus.
-Can I still receive OTA updates after unlocking the bootloader?
-Answer: Yes. Your phone really does not change at all when you unlock the bootloader. You will still receive updates from Google. Now, if you start putting on custom recoveries and rooting, you may run into issues with receiving OTA updates. The good news is that Google usually releases the system image files for their Nexus phones which makes it a breeze to go back to stock for updates.
_____________________________________If you run into issues along the way, be sure to drop them in the comments and we will all do our best to help you get through them. The SDK portion will be the most difficult, but there are countless resources out there to get you fully up and working in that department. Once the SDK is ready to go, this really only takes about 5 minutes.