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[Intro Music]

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We have just successfully installed

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'htop' utility; and now let's run

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it. 'htop', and now you see that this

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utility shows processes in more

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nice looking way, and you could

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perform different actions with

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every single process. For example,

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you could select process by using

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up and down arrows like so. For

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example, let's select 'htop' process,

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and let's kill it. For that you

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could use F9 key. Let's press

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it, F9. And now you could select

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in this left section, which

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signal will be sent to the process you

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want to kill. And you could send

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different signals. And by default,

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when you want to stop specific

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process, you usually send SIGTERM

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signal. Let's select this signal, and

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press Enter, Send, and 'htop'

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process was terminated. And if I

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have a look at the running

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processes now, I will not see

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htop process here in this list.

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Alright, let's start htop once

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again. Actually, let me make it a

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bit larger like this. And let me

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also show you how you could perform

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different setups for this output.

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For that you could press F2 key. F2,

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like this, and you could select

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which meters you want to see in

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different sections. For example,

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here in the left column, by

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default, you see CPU usage, Memory

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usage and Swap usage. If you want,

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you could move for example, this

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Memory up like so. And you'll see

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that Memory was moved and now

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it is placed before CPU like this.

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Let's press Enter in order to

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finalize moving action. And now let

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me show you how you could add

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additional 'Available meters' to this

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left or right columns. And let's

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for example, select the Hostname,

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and add it to this right column, and

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you'll see that Hostname of this

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computer was appeared here in this

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right column. All right. Also, you

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could perform different other

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actions like change colors. For

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example, let's adjust theme, and

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let's choose this one, Light Terminal

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now. No, it looks bad. Let's choose

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this one, and let's go back to

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Default. And also you could change

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Display options, add some

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additional parameters and so on.

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That's how you could modify view of

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htop utility. Great. Also in

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this output, I wanted to show you

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this column, Command. And this column

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shows specific corresponding

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command that was used for start of

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corresponding process. I have told

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you that when you enter any

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command, Linux simply starts

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process. That's it. And in this

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case, you see that this root

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process was started using '/bin/bash'

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command; and this 'bash' process was

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started simply by a 'bash' command.

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And the difference here appears

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because by default, when you start

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a new Ubuntu container, there is a

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default command that is executed

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when container is created; and this

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command is '/bin/bash'. And actually,

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you could start every process using

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either full path to corresponding

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executable file, or you could use

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shortcut if Linux knows about

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location of corresponding

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executable file. And we could use

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'bash' command because there is

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PATH variable that holds different

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paths to 'bin' folders that hold

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different utilities, and 'bash' is

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located in one such folders.

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That's why you could use either a

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full path to corresponding utility

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or short version like 'bash' or 'htop'.

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Let me show you that quickly.

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Let me exit from htop. For that,

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press F10, and here let me do

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following, let me clear terminal

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first, make it a bit larger, and

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let's find path to htop utility,

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'which htop', here is its path. And

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I could use this path in order to

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start htop process. Let me copy it,

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paste here, and press Enter. And I

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see again htop process that is currently

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running. But now in this table, I see

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that the htop process was started

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using '/usr/bin/htop' command.

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Alright, that's how you could use

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htop utility in order to monitor

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running processes. And please

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notice that this nice looking

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application is actually running

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inside of the terminal. It is a

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terminal application. Alright,

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that's all for this lecture. And

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next let me show you a list of

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processes on other computer where I

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have a separate Ubuntu Installation,

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not container. I'll see you next

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guys. Bye-Bye.

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[no audio]