Disclaimer 1 : I tried to look for something like this but I did not found it. Then I tried to achieve it. Sorry if they are well known steps 
This guide allows to root a Nexus One with unlocked bootloader with NO need to flash recovery
USE THAT INFORMATION AT YOUR RISK!!
Updated: Added a line to work with Gingerbread
That steps are for Ubuntu. If you are any interested windows user, please let me know.
Prerequisites:
1. Download fastboot
2. Obtain busybox (anyone have any direct link?) - NOT GOING TO FLASH CM, JUST GETTING busybox from a trusted place
3. Download su
-- UPDATE: that link broken, you have to donwload it from Google Play
4. Download recovery-RA - NOT GOING TO FLASH IT, DON'T WORRY!!!
5. Reboot to bootloader - JUST BOOTING WITH, NO FLASHING
6. Root it!
7. Reboot and enjoy rooting
This guide allows to root a Nexus One with unlocked bootloader with NO need to flash recovery
USE THAT INFORMATION AT YOUR RISK!!
Updated: Added a line to work with Gingerbread
That steps are for Ubuntu. If you are any interested windows user, please let me know.
Prerequisites:
- Unlocked bootloader
- adb working properly
1. Download fastboot
Code:
wget --referer=http://developer.htc.com/adp.html http://dl4.htc.com/RomCode/ADP/fastboot.zip
unzip fastboot.zip
chmod u+x fastboot
rm fastboot.zip2. Obtain busybox (anyone have any direct link?) - NOT GOING TO FLASH CM, JUST GETTING busybox from a trusted place
Code:
wget http://download.cyanogenmod.com/get/update-cm-7.0.0-N1-signed.zip
unzip update-cm-7.0.0-N1-signed.zip system/xbin/busybox
rm update-cm-7.0.0-N1-signed.zip3. Download su
-- UPDATE: that link broken, you have to donwload it from Google Play
Code:
wget http://dl.dropbox.com/u/6408470/su-releases/su-2.3.6.1-ef-signed.zip
unzip su-2.3.6.1-ef-signed.zip system/app/Superuser.apk system/bin/su
rm su-2.3.6.1-ef-signed.zip4. Download recovery-RA - NOT GOING TO FLASH IT, DON'T WORRY!!!
Code:
wget -O recovery-RA-passion-v2.2.1.img http://files.androidspin.com/files/amon_ra/RECOVERY/recovery-RA-passion-v2.2.1.img
md5sum recovery-RA-passion-v2.2.1.img
echo ... Validate md5sum is 3def709ab1c9e051a92a1c8b1504a36a5. Reboot to bootloader - JUST BOOTING WITH, NO FLASHING
Code:
adb devices
adb wait-for-device
adb reboot-bootloader
fastboot boot recovery-RA-passion-v2.2.1.img
echo ... Waiting for recovery image load
while [ -z `adb shell pwd 2> /dev/null` ]
do
sleep 1
done6. Root it!
Code:
adb shell mount /system
adb push system/xbin/busybox /system/bin/busybox
adb shell chmod 4755 /system/bin/busybox
adb push system/bin/su /system/bin/su
adb shell chmod 4755 /system/bin/su
adb push system/app/Superuser.apk /system/app/Superuser.apk
adb shell chmod 4755 /system/app/Superuser.apk7. Reboot and enjoy rooting
Code:
adb shell reboot
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