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?