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Today I'm going to walk you through

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how to create, modify and delete groups in Linux.

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Groups allow us to grant access

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in a more efficient manner.

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Groups associate user accounts

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that have similar security requirements,

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and they also help simplify our task as administrators

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by allowing multiple users

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to be granted permissions to resources.

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So, in this example,

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we're going to imagine we have a organization

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that require us to have four different departments.

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We're going to use the graphics, sales, marketing,

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and finance departments.

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Okay, so let's go ahead and add the graphics department.

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So first, we're going to do sudo, going to do groupadd Graphic.

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It asks for my password here.

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All right.

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Now we can check the groups in the etc/group folder,

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or the group file.

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You can see graphics there at the bottom.

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Now, if we're going to go over the fields really quick,

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the group instance has four fields associated to each group.

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The group name,

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the next field is going to be the passwords,

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then the group ID,

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and the last will be a list of all the users

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that are part of that group.

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Now, currently the graphics is blank

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'cause we haven't added any users,

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but as we go throughout the example,

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we're going to come back after we added some users

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and we're going to see it populate there.

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All right. Let's clear this out.

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And we go ahead add the other departments.

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Go ahead and scroll up, use the (indistinct) first.

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We're going to do sales department,

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then do marketing department

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and then finally finance.

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Boom.

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Alright, again, we're going to go and check and make sure

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those groups were added on the etc/group file.

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All right, boom. We see 'em at the bottom there.

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Next we're going to go over modifying the group.

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Now, if you see I've named all the other departments,

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sales department, marketing department, finance department.

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But graphics just doesn't match.

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So to keep the scheme the same

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we're going to modify this group.

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Sudo group, mod,

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use the N option,

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and we're going to change the name first

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to the graphics department.

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And then we're going to point to the actual group

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that we're trying to change.

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All right.

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So we see we've changed the graphics department.

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We see that at the bottom there.

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Next, what we're going to do

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is we're going to add users to the groups.

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Now for this example,

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and to add users, we're going use the user mod command.

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We're going to use sudo, user mod,

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and for the option, we're going to do append group.

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And so we're going to use myself,

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and we're going to add me to the graphics department.

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All right, let's see if that went through there.

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Now you see at the bottom, J Kelly,

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is part of now the graphics department.

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So we're going to use the other users again

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to see which users we have from the password file.

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And so we're going to add Anderson, Mason, and Riley.

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We're going to add them to different groups,

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just for little practice.

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I don't want to type them all the way out.

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So we're going to do C. Mason there.

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Marketing.

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We're going to do (indistinct).

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A. Riley.

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All right.

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I was going to verify that we have everything taken care of.

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All right, simple as that.

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We see we added C. Mason to the sales department,

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M. Anderson to the marketing department,

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A. Riley to the finance department,

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And again, I, Jamario Kelly, am in the graphics department.

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And similar to modifying user accounts,

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we can delete groups.

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Simply to delete a group,

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we're going to use the sales department.

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And again, it's kind of like user mod or user delete

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but instead it's going to be group delete.

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We're going to use sales department.

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Now, deleting the group does not delete the members

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that are in the group.

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And we can verify this by going back to the etc.

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So let's see.

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Etc/group.

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We see the sales department is gone.

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And I believe we had C. Mason in the group

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for the sales department.

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So let's check and see if C. Mason's still out there.

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So we go to etc file, go to cat/etc. Password.

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And we see C. Mason is still an active user.

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So deleting the group did not delete the users

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that was associated to the group.

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So that's good to go there.

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All right, that was quick and easy.

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We went over how to create, modify and delete groups.

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And I'll see you again in the next lesson.