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. 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. The basic rights are read, write, and execute. Users are, as the word says, all the account that you created on the system. Group are defined also by a number called GID.
If you run for example the command "id root" you'll have as results something like that:. In case you create your test user adding the group id or gid as "0" useradd test -g0 , you'll note that launching the command "id test" the gid is0 such as for root:. Once you know this will be easy to understand the difference betweet group ownership and user ownership. In case you have more than one user inside the same group and you want to allow only one of them to modify something, you can easily use the ACL.
Group- No of people come under single group ie: create user and bring him under administrator group,so he can do all the change as like administrator. This is security options from linux system. There are a lot of built-in accounts with obscure names and vague descriptions, so it can be confusing. Authenticated Users encompasses all users who have logged in with a username and password. The Authenticated Users group includes all users whose identities were authenticated when they logged on.
This includes local user accounts as well as all domain user accounts from trusted domains. A Guest account is a built-in account on a Windows system that is disabled by default.
If enabled, it allows anyone to login without a password. Contrary to popular belief, anyone who is logged in anonymously—that is, they did not authenticate—will NOT be included in the Everyone group. When it comes to permissions, one critical question we need to be able to answer is: which humans have access to a particular resource? I'd have user1 and user2 in a group as you suggest. And user3 I'd leave out entirely so they they were considered as "other".
If you had yet other accounts on the system that should not be able to access these directories like user3 , I'd create another group containing all the permitted users and use a directory with that group permission to host the target directory:. Here only the owner of a file may delete it or the owner of the directory - no matter the group permissions.
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Learn more. Difference between owner and group Ask Question. Asked 7 months ago. Active 7 months ago. Viewed times. I don't know if this is the best practice for a shared dir I want to avoid ACL if possible. Improve this question. Add a comment.
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