How to root the Google Nexus 5???

Resource Links:

• Forum Post
• Chainfire's CF-Auto-Root Site
• CF-Auto-Root Download Page

Install prerequisites (for 64-bit Debian/Ubuntu-based install):

• sudo apt-get install lib32z1 lib32ncurses5 lib32bz2-1.0 lib32stdc++6
• Extract the zip file
• Then "chmod +x root-linux.sh" to make the script executable.
• Run "./root-linux.sh"
• Follow the on-screen instructions.

On Windows Just Double Click the Batch File "root-windows.bat" instead of the Linux Script Shown in the Video.

Source :- XDA