What is difference between group and user

Question

I am totally new to Ubuntu.
I just start to learn about Ubuntu.
So please help me to learn about Ubuntu.

Answer 1

User is an account, either for real person or a daemon software. You can log in with your user account, or others using su.

Groups can be thought of as levels of privilege. A person who is part of a group can view or modify files belonging to that group, depending on the permissions of that file. User belonging to a group has privilleges of that group, for example - sudo groups lets you run software as super user.

Answer 2

Users can be either people, meaning accounts tied to physical users, or accounts which exist for specific applications to use. Groups are logical expressions of organization, tying users together for a common purpose. Users within a group can read, write, or execute files owned by that group.

Each user and group has a unique numerical identification number called a userid (UID) and agroupid (GID) respectively. A user who creates a file is also the owner and group owner of that file. The file is assigned separate read, write, and execute permissions for the owner, the group, and everyone else. The file owner can be changed only by the root user as well as access permissions can be changed by both the root user and the owner of the file.

Source : http://www.bayt.com/en/specialties/q/110533/what-is-the-difference-between-a-user-group-and-others-in-red-hat-linux-what-is-the-use-of-group-ownership-amp-user-ownership-of-a-file-or-folder/

Answer 3

Multiple users can use privileges of a group. For example if a group has permission to read, write or execute one particular file or folder, or change one specific setting, all the users within that group will inherit this privilege.

You can find different kinds of privileges that a user or a group may have or not here

Answer 4

If you are new to Linux/Unix, then the concept of permissions may be confusing. This Link will provide you with an explanation of what permissions are, how they work, and how to manage them. A number of examples will be provided to illustrate how to set and change permissions for both users and groups.

https://www.linode.com/docs/tools-reference/linux-users-and-groups