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Introduction to UNIX for Web Developers
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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