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In this video we'll
talk about advanced Linux permissions.

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There's one thing that
you need to know.

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In many cases you will
never need advanced Linux permissions.

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So this is the
special case permissions and

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let's try to understand
how it is working.

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So the first permission is
set user id, also known

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as suit, and that has
the octal value of 4.

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It only has a meaning on
files. And on files it means

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that you run the VAL as
the user owner of that file.

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And I will show you
that's actually a pretty dangerous permission.

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Then we have set groupid, also known as sgid, which
is the octal value of 2, and on files that

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means that you are going to run the VAL
as the group owner of that val. That's pretty uncommon.

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But on directories it sets ownership on newly
created items as the group owner of that directory.

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I'll show you
why that makes sense.

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Then we have sticky bit and sticky
bit has the octal value of 1.

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And on directories it allows a user
to delete files if the user is

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file owner or the user is directory
owner. In the next video I'll demonstrate.