Android 6.0.1 (Build M4B30Z) Root for Nexus 5

gistfile1.txt

# Download latest Android image, "hammerhead" for Nexus 5 (GSM/LTE)
https://developers.google.com/android/nexus/images#hammerhead

# Download latest TWRP
https://dl.twrp.me/hammerhead/

# Download latest SuperSu
https://download.chainfire.eu/supersu

Enable USB debugging.
Reboot into bootloader (power off, volume down + power on or sudo adb reboot-bootloader)
# Wait for boot loader to start
# Install factory ROM:
unzip hammerhead-m4b30z-factory-625c027b.zip
cd hammerhead-m4b30z
unzip image-hammerhead-m4b30z.zip
sudo fastboot flash bootloader bootloader-hammerhead-hhz20h.img
sudo fastboot reboot-bootloader #or power off/start bootloader
sudo fastboot flash radio radio-hammerhead-m8974a-2.0.50.2.30.img
sudo fastboot flash boot boot.img
sudo fastboot flash cache cache.img
sudo fastboot flash system system.img
# add params -S 256M if remaining memory is not enough . eg: sudo fastboot flash -S 256M system system.img
sudo fastboot flash recovery recovery.img
sudo fastboot reboot

# Wait boot to finish for application upgrade.
adb push SR3-SuperSU-v2.79-SR3-20170114223742.zip /sdcard/
adb reboot-bootloader

# [Wait for bootloader to start]
sudo adb start-server
sudo fastboot flash recovery twrp-3.0.3-0-hammerhead.img
sudo fastboot reboot-bootloader
# on the screen, Navigate into Recovery mode -> Install -> zip, select SR3-SuperSU-v2.79-SR3-20170114223742.zip -> Swipe to confirm Flash
# Reboot System