How To Enable Passwordless Sudo For A Specific User in Linux

This can be done in 3 quick steps:

1. Open the sudoers file: sudo nano /etc/sudoers
2. Find the line that contains includedir /etc/sudoers.d
3. Below that line, add username ALL=(ALL) NOPASSWD: ALL, where username is the user you want to grant passwordless sudo to. Save your changes.

You're done. From now on, that user can run sudo any_command without entering a sudo password.