Sudoers File To Allow Certain Users Use Command Without Password

Login Linux server as root.
Create new group. Example king .groupadd king
Create new user and directly add it into just created group. Example kong . Make sure to assign it a password.useradd -G king kong
Edit sudoers file.vi /etc/sudoers
At the end of the line, put the line given below and save it. Example we use here is command to list users. Please note that % put in front of means we make it for group but if there is no %, means we make it for single user.

%king ALL=(ALL:ALL) NOPASSWD: /bin/cat /etc/passwd
Test the sudo command. It will execute without password needed.sudo cat /etc/passwd
To block certain commands, can use !. Example, !cat /etc/passwd.
To make sure user allowed to use certain commands only. farid ALL = NOPASSWD : /bin/passwd mamat .
To make sure group allowed to use certain commands only. %faridah ALL = NOPASSWD : /bin/passwd mamat .