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Groups

As mentioned earlier, a multi-user environment allows there to be many users logged on to the same machine at the same time. The users' files, as well as the rest of the files in the system, have associated permissions. These permissions are specified for the owner of the file, the group to which the user belongs, and all users. It is the group concept that we would like to look at briefly now. In later chapters, we will look at working with groups.

A group can have a group password, although use of a group password is uncommon. Additionally, a group has a group ID number, name, and members. As you saw when we created a user, the default group ID for a user created by using the User pane is 20, which is the staff group. If you look at the staff group, however, you do not necessarily see all those who belong to the group actually listed in the group.


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