WEBVTT

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All right. Hello and welcome

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to Command Line Survival, part one

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for the command line basics course

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here on SIBERRY.

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So this module

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will take you into a bunch of

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different tips and techniques that

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you can use to really work through

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the command line and save

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time and hopefully

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help get you much more comfortable

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with the command line.

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So in this module, we've going to

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learn autocomplete techniques,

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learn how the Iraqis are utilized

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at the same time and understand

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how did you come in history.

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These are all very important

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concepts that you need to understand

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while you're working at the command

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line.

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Right assessment, so what is the

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best way to cement a previously

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entered command?

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Is it going to be a pressing the

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control key and H.

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B, open the Basche history

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file and copy paste, C,

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use the up arrow key or D,

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press the control key and Z,

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we want to resubmit a previously

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entered command.

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If you said see the up arrow key,

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you're correct.

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It helps cycle through previously

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entered commands and is very

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quick and easy to use.

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Pressing the control keying H does

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not really do anything.

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The command line and it

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is true you can open the Basche

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history file and copy and paste

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it into the command line

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window, but that's a lot

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of extra steps and it's not very

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easy.

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And then pressing the control key

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and Z actually ends

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any running process at the command

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line terminal, which will learn in

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the our command line

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survival part one.

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All right.

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So typing commands

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in order to type of command, you

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need to be able to

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identify what you're trying

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to accomplish.

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It's it's very easy to start

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typing commands without

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knowing exactly what you want

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to do.

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So if you can understand what

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you're trying to do from the command

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line, then that

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will help you choose which command

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to use which which is what

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parameters and how to really attack

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your problem.

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So like I was saying before, the

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command kind

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of syntax is you need the command,

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a switch and then a parameter.

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So in this example,

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we are going to search for

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a weakness, grep search

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for Frankenstein and

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we're using the tech or the dash

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switch.

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And if you look it up in the manual,

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the dash I switch,

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it stands for case insensitive.

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So if we look for Frankenstein,

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it doesn't have to be capitalized

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and it'll grab

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matches for anything that is not

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capitalized.

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And

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you can always press the energy to

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enter your command.

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Pretty straightforward.

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All right. Some very important

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commands that you need to understand

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while you're working at the command

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line. We have probed

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stands for Working Directory.

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It shows the current directory you

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are in while you are in class.

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This is very useful.

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So you know what is where

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you're at in the file system.

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Now, if you want to know what's

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inside of the directory you're in,

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you're going to use the command

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for windows or the endless command

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for Linux and Dursban

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for directory.

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And Ellis stands for listing

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and it lists everything in

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your present working directory,

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that working directory command

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that you just used.

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And it will show all the files in

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there.

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And then if you want to be able to

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move to a different directory,

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you're going to use the CD Command,

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which is change directory, and

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that will help you move to different

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folders so you can look through

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Uster or else from there

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and be able to see what's in there.

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So let me give you a quick example.

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So for here, this

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is for Windows.

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If I cheat,

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we are going to do different work

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directory.

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Excuse me.

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So this will change

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everything in our directory here.

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This is for my personal folder.

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And then if we want to change

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directory, CD

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and desktop,

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because we can see that there is a

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desktop folder here.

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All right. And now we're inside the

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desktop folder.

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If we want to see what's inside of

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there, type DYA

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and enter.

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And this is what we have inside my

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desktop folder.

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This is for Windows.

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All right. So for Linux, we are

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going to type DVD

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and this will print a working

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directory which is flash home slash

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user.

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And you can also tell because

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before the command line symbol

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we have the tilde, which,

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as you know, when Linux is for the

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home folder and

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now if we want to see what's inside

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of this folder, I'm going to type

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for list and it shows everything

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inside of this folder.

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Now, what I highly recommend for

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doing as a security professional is

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to do Ellos Tech LTA

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and that will list everything

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and show you

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all of the permissions

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for the files.

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And it will also give any

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hidden files.

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So as you'll see right now,

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this was the first listing we got

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and it showed all of these folders

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that I have.

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But these files,

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they don't, as you know, are hidden

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files and Linux and

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using the A switch

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and lets us see all the files,

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including the hidden files.

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So this batch history file,

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it is not in this first listing

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because it is a hidden file.

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All right.

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So let's move on.

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So autocomplete techniques,

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we use the tab key tab

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completion is your friend.

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It will save you so much time.

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So it will only complete within

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the present working directory that

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you're in.

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And if there are more than one match

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for something you're typing

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out, you can press tab twice and it

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will list all the matches.

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So let me show you here

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that say dot

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less

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dot B, because we have

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a bunch of files, three

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files here that have the be there

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and they all start

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with Besch.

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So I push the tab there and

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if I push tab twice, it will show us

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all of the files that match

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that.

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But let's say I want it to change

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or go

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through the pseudo add admin

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successful file.

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That's a lot to type, right?

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So we type Suto

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sound right here and

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then tab and it will auto completed.

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Also I don't have to type it and

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that's great because it saves

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my time. Saves your time.

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We all do. Great.

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All right.

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Aoki's at the Seelie.

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We get the up and down key up

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scrolls through previous commands

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and down scrolls back from

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the key super useful.

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It will save you a lot of time

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because you were going to be

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constantly repeating commands.

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So let me show you that real quick

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so

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you could see a push up here.

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And we got back our previous command

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push the up key again, our

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delay.

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Ellis pretty.

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If I go back down the down

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arrow, it bring us back down

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through those commands.

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That will save you a lot of time

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because you're going to be

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constantly resubmitting different

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commands that you were doing as a

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secured.

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All right. Command history for

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Windows.

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Pretty straightforward.

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We have the seven key and you can

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also type dashikis flash history.

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Now, it is important to note

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that there is no persistent command

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history in windows by default.

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And if you want to save

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your command history in Windows,

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then I'd recommend

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typing the slash history command

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and then just copying pasting

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everything right out of the command

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window into a text file.

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Other than that, there is no really

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kind of persistent command history

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like there is for Linux.

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So like I was saying for Linux,

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there is the best history

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file in a home folder

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and that records a user's

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history in the back in

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the shell.

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So if you as I showed

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up here in the top right, if we

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do cat bash history

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and you will learn that the cat

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command is for CONCATENATE

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and it spits out anything in a

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file, and it'll show us that

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all the previous commands that I did

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for this user account.

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And then there's also the history

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covid where we can type.

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We will show all the previous

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commands that we typed as well.

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All right, post the segment,

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which command tells you what

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director you're in.

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Is it A pretty B

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folder, C cat

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or D Echo?

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And we want to know which folder we

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are in.

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And if you said a DVD for

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working directory, you're correct.

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The folder command is a real

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command.

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The cat command is used

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to spit out the contents

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of a file for concatenate.

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And it's not for telling you what

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directory you're in.

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And the Echo Command is

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used to send

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text back out of the

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command line interface that you'll

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learn. But it's not to tell you

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which directory.

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Right?

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All right. So in this video, we

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learned autocomplete techniques,

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learned how to use the Iraqis that

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are utilized at the Seelie and

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understand how to view command

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history. And I hope to see you in

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the next video.