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So first you set to delete the fifth line of the
value users that you created in lesson five in lesson six lab.

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So let's do cat on users and
there we can see that this is

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the line that we are going to
Delete. So set -i5d on users and

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now showing it again. And as you
can see the swift line is gone.

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Second part was to use awk in a pipe
to filter the first column out of the results of

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the command psaox. So this is psaox and we
need awk. So I would use AWK print $1.

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AWK is pretty good at finding a field
separator that is based on spaces and depths.

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And as you can
see that is working pret.

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Next we use grep to show names of all files
in etc that have lines starting with the text root.

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That would be grep l
because we need the names

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of vals and not
specifically the contents in etc.

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And we are looking for
what? Well, let's do the

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regular expression before the
where we want to search.

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We are looking for lines that are starting with root
and maybe we want to make that case insensitive as well.

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And oh boy, that's a
lot of errors and so on.

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So sudo grab il and why
wouldn't we make that recursive as well?

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There I need to enter my sudo password
again. And here we have all of these files.

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Then use grep to show all lines in
the file users that contain three letters N.

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You know what I would go for?
I would go for grep nnn in users.

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Doesn't have to be
much harder than that.

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Is that correct? If I
don't see a result, then I

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want to make sure that
we are doing the right thing.

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Well, the right thing kind of depends
on how you want to do it.

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Maybe we should interpret
it in a different way.

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Like this for instance. And
then we have a match.

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That's how we can
interpret it as well. Right?

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All lines in the values that contain
three letters n. Nothing states that there

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can't be anything in between the letters
n. So the dot star that I've

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inserted in the pattern is for
zero or more characters between the n's.

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And then the last one, find
all lines ending with well, that should

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be text $in users. And there
we can see all lines ending with

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the text Anna. And that's it.
Let's move on to the next lesson.