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Bash | Find out the usage of a certain PORT

When I was trying to run to generate SSL certification, I got an error:

[Sat May  9 18:54:10 HKT 2020] tcp port 80 is already used by 
[Sat May  9 18:54:10 HKT 2020] Please stop it first
[Sat May  9 18:54:10 HKT 2020] _on_before_issue.

I believe it is expected to show the service which is using port 80 in the first line, but nothing at all. I have to find out my self.

sudo netstat -tulpn | grep :80

I got the output:

tcp6       0      0 :::80                   :::*                    LISTEN      10541/apache2

Oh, yes, Apache2. I wanna shut it down temporally:

sudo systemctl stop apache2

Now, generate cert again:

~/ --issue -d --standalone --keylength ec-256

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