markdown

_Examples:_
1. Allow username to run various commands:

```
username ALL=/sbin/halt, /bin/kill
```
1. Allow user username to run /sbin/halt without any password i.e. as root without authenticating himself:

```
username ALL= NOPASSWD: /sbin/halt
```
1. Allow user username to run any command from /usr/bin directory on the system dev:

```
username dev = /usr/bin/*
```
