Running sudo command without password

What I found out is that running a command using sudo without entering password there are two options:

• echo PASSWORD | sudo -S COMMAND
• adding following lineto /etc/sudoers:

username ALL=(ALL) NOPASSWD: COMMAND

Please note that this has to be after all group definitions.
You can check what sudo priviliges you have using

sudo -l

For this case this gives:

(ALL) ALL
(ALL) NOPASSWD: COMMAND 

This means that all command require password except for the COMMAND. If we would put the username definitin before group definitions sudo -l would give:

(ALL) NOPASSWD: COMMAND
(ALL) ALL

This would still require password for all commands.