Original subtitles

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All right time to roll up our sleeves and get our hands dirty let's familiarize ourselves with some

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basic commands and Linux.

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But before we do that I want to keep something very important in mind.

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Linux is case sensitive.

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So if we're typing the word password for example and we use a capital P that's very different than using

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a small p I've unfortunately seen this happen and training videos where the instructors are trying to

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access some files or using some commands and they're using the wrong capitalization and they're wondering.

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Live in the training.

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Why is it not working.

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I can believe that instructors could do that.

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Please be careful about this.

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If you're new to Linux you're completely forgiven to do that.

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If you don't the structure of doing that.

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Not as much.

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Are they trying to access Foz and the Nexus not as forgiving as Windows.

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Unfortunately so.

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So a file that has the name test using capital-T if you try to access the test file using a small t

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that would not work.

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Now though we talked about this he had other objectives for this section we're going to be learning

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how to move around the file system how to change directories and jump from one directory to another.

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We're going to be learning how to create files and directories then obviously we want to see the content

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of these files and directories.

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We're going to learn how to do that as well.

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And last but not least we're going to be learning how to copy move and delete these files and directories.

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There are a couple of things that we want to keep in mind when we're talking about commands in Linux.

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The fact that commands have a certain structure and with this structure come to things options and arguments

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options are things that change how the tool or the command behaves and the usually letters preceded

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by a hyphen.

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You can use more than one option.

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So for example the ls command is a command that lists contents of a directory.

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Now don't worry we're going to be seeing this practically later on the LS on itself would behave in

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a certain manner.

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If we type for example L S minus H or minus one help it will display something completely different.

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This is the option that we're using here.

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The minus H minus a and so on.

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The other thing that we want to be taking into consideration is that commands have also arguments on

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top of options and arguments usually are extra pieces of information to tell the command what to act

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on.

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So for example if I'm using the L as command without any arguments the LS will display the content of

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my current directory.

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So for example if I'm in the documents directory and I type s I'm going to see the contents of the documents

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directory.

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If however I type an S for those lasht desktop I'm going to be seeing the contents of the desktop directory

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in this particular case desktop as my command arguments the example you see in front of you is L S minus

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l forward slash desktop minus L is the option and it changes the way that displays the content of desktop

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which is my argument.

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Again if this sounds confusing don't we we're going to be seeing plenty of examples and I promise you

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we're going to be finding this very easy in no time.

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So what are the basic commands that we're going to be exploring in this section PWT which stands for

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print working directory CD which is change directory and Dione on which is to make or create a directory

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touch which we use to create a file and S which is a commando we use to list directory content.

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We're going to be also looking at the cat commands which means concatenate or display a file contains

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less command which shows the file content and a different way had dash and stance for the numbers for

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example had minus 10 had minus 50 which displays the first and number of lines of a file by default

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then.

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So for example if I type had filed that XTi I'll see the first 10 lines on the file the XTi tail will

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show me the last 10 lines or 50 lines or whatever I'd replace and with tail minus f tells me to follow

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the end of a changing file.

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If it's a live file if it's changing while I'm looking at it I can use that tail minus the C command

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stands for copy file and vi is move or rename fine.

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And our MDI are for removing files and or directories.