I need to run something as sudo without a password, so I used visudo and added this to my sudoers file: MYUSERNAME ALL = NOPASSWD: /path/to/my/program Then I tried it out: $ sudo /path/to/my/program [sudo] password for MYUSERNAME: Why does it ask for a password? How can I run/use commands as root with a non-root user, without asking for a password?

You have another entry in the sudoers file which also matches your user. The NOPASSWD rule needs to be after that one in order for it to take precedence.
Having done that, sudo will prompt for a password normally for all commands except /path/to/my/program, which it will always let you run without asking for your password.