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In this video, we'll
talk about creating groups.

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Creating groups requires GroupAdd. It's
pretty simple. Use groupadd followed

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by the group name
to create a new group.

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And if you want to add users
to a group as a secondary group,

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then you use user mod ag, group
name username. Now, what is this ag

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about? Well, user mod G requires you
to specify a list of secondary groups.

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This list of secondary groups will override
all current secondary group assignments. So if you

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want to add users to a new
secondary group without removing them from currently existing

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secondary groups, you use user mod ag
on the group name. Let me demonstrate.

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So let's start with ID on user Anna. And we can
see that user Anna is a member of the group 1004.

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That's a
private group.

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Now I'm going to
use sudo group add sales.

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And then I'm
going to use sudo

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user mod a
uppercase g sales Anna.

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So now let's do ID Anna to
figure out what user Anna has as configuration.

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So user Anna is a member of
group Anna as well as group Sales.

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Now let me show
you the wrong approach. I'm

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going to use user
mod g wheel for Anna.

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And then I'm repeating my I.D. anna. And look at
that, she's no longer a member of the group sales.

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That is why
we really needed this.

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A for append and g for uppercase
g. And that will make sure that the

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user is added to the group without
overwriting any of the existing group memberships.