[Introduction to UNIX for Web Developers]
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The Group File
The group file contains information about UNIX groups. UNIX groups allow multiple users to be related for security purposes. This is best seen by example.

Imagine a situation in which all engineers can modify technical notes, but marketing employees can only read them. They cannot modify them. Thus, there are two groups: marketers and engineers, each with different rights in the system.

The group file is also a colon delimited file of multiple lines which looks something like this:

engineers:*:101:selena gunther eric

The fields are:

group name:password:group id:users

So how do you know who you are?

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