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These are the user uploaded subtitles that are being translated: 1 00:00:01,900 --> 00:00:08,650 All right time to roll up our sleeves and get our hands dirty let's familiarize ourselves with some 2 00:00:08,650 --> 00:00:11,890 basic commands and Linux. 3 00:00:11,890 --> 00:00:16,010 But before we do that I want to keep something very important in mind. 4 00:00:16,090 --> 00:00:18,310 Linux is case sensitive. 5 00:00:19,280 --> 00:00:25,580 So if we're typing the word password for example and we use a capital P that's very different than using 6 00:00:25,610 --> 00:00:32,000 a small p I've unfortunately seen this happen and training videos where the instructors are trying to 7 00:00:32,000 --> 00:00:37,640 access some files or using some commands and they're using the wrong capitalization and they're wondering. 8 00:00:37,640 --> 00:00:38,960 Live in the training. 9 00:00:39,080 --> 00:00:40,990 Why is it not working. 10 00:00:41,060 --> 00:00:43,520 I can believe that instructors could do that. 11 00:00:43,520 --> 00:00:45,520 Please be careful about this. 12 00:00:45,680 --> 00:00:49,160 If you're new to Linux you're completely forgiven to do that. 13 00:00:49,280 --> 00:00:51,210 If you don't the structure of doing that. 14 00:00:51,320 --> 00:00:52,620 Not as much. 15 00:00:52,780 --> 00:00:56,000 Are they trying to access Foz and the Nexus not as forgiving as Windows. 16 00:00:56,000 --> 00:00:57,370 Unfortunately so. 17 00:00:57,500 --> 00:01:03,380 So a file that has the name test using capital-T if you try to access the test file using a small t 18 00:01:03,620 --> 00:01:05,150 that would not work. 19 00:01:05,180 --> 00:01:11,560 Now though we talked about this he had other objectives for this section we're going to be learning 20 00:01:11,560 --> 00:01:18,630 how to move around the file system how to change directories and jump from one directory to another. 21 00:01:18,630 --> 00:01:25,160 We're going to be learning how to create files and directories then obviously we want to see the content 22 00:01:25,160 --> 00:01:26,460 of these files and directories. 23 00:01:26,450 --> 00:01:28,310 We're going to learn how to do that as well. 24 00:01:28,610 --> 00:01:36,710 And last but not least we're going to be learning how to copy move and delete these files and directories. 25 00:01:36,740 --> 00:01:41,080 There are a couple of things that we want to keep in mind when we're talking about commands in Linux. 26 00:01:41,090 --> 00:01:49,700 The fact that commands have a certain structure and with this structure come to things options and arguments 27 00:01:50,810 --> 00:01:59,270 options are things that change how the tool or the command behaves and the usually letters preceded 28 00:01:59,270 --> 00:02:00,520 by a hyphen. 29 00:02:00,650 --> 00:02:02,600 You can use more than one option. 30 00:02:03,490 --> 00:02:08,740 So for example the ls command is a command that lists contents of a directory. 31 00:02:08,740 --> 00:02:14,510 Now don't worry we're going to be seeing this practically later on the LS on itself would behave in 32 00:02:14,510 --> 00:02:15,680 a certain manner. 33 00:02:15,710 --> 00:02:22,950 If we type for example L S minus H or minus one help it will display something completely different. 34 00:02:23,330 --> 00:02:25,660 This is the option that we're using here. 35 00:02:25,660 --> 00:02:29,050 The minus H minus a and so on. 36 00:02:29,090 --> 00:02:34,010 The other thing that we want to be taking into consideration is that commands have also arguments on 37 00:02:34,010 --> 00:02:41,140 top of options and arguments usually are extra pieces of information to tell the command what to act 38 00:02:41,140 --> 00:02:42,100 on. 39 00:02:42,100 --> 00:02:49,390 So for example if I'm using the L as command without any arguments the LS will display the content of 40 00:02:49,390 --> 00:02:50,440 my current directory. 41 00:02:50,440 --> 00:02:56,620 So for example if I'm in the documents directory and I type s I'm going to see the contents of the documents 42 00:02:56,620 --> 00:02:57,770 directory. 43 00:02:57,760 --> 00:03:04,870 If however I type an S for those lasht desktop I'm going to be seeing the contents of the desktop directory 44 00:03:05,460 --> 00:03:13,330 in this particular case desktop as my command arguments the example you see in front of you is L S minus 45 00:03:13,390 --> 00:03:22,060 l forward slash desktop minus L is the option and it changes the way that displays the content of desktop 46 00:03:22,330 --> 00:03:24,410 which is my argument. 47 00:03:24,460 --> 00:03:30,550 Again if this sounds confusing don't we we're going to be seeing plenty of examples and I promise you 48 00:03:30,550 --> 00:03:33,510 we're going to be finding this very easy in no time. 49 00:03:33,520 --> 00:03:39,310 So what are the basic commands that we're going to be exploring in this section PWT which stands for 50 00:03:39,520 --> 00:03:47,560 print working directory CD which is change directory and Dione on which is to make or create a directory 51 00:03:47,890 --> 00:03:55,250 touch which we use to create a file and S which is a commando we use to list directory content. 52 00:03:55,240 --> 00:04:01,250 We're going to be also looking at the cat commands which means concatenate or display a file contains 53 00:04:01,630 --> 00:04:08,740 less command which shows the file content and a different way had dash and stance for the numbers for 54 00:04:08,740 --> 00:04:16,560 example had minus 10 had minus 50 which displays the first and number of lines of a file by default 55 00:04:16,710 --> 00:04:16,990 then. 56 00:04:17,000 --> 00:04:23,740 So for example if I type had filed that XTi I'll see the first 10 lines on the file the XTi tail will 57 00:04:23,740 --> 00:04:31,660 show me the last 10 lines or 50 lines or whatever I'd replace and with tail minus f tells me to follow 58 00:04:31,720 --> 00:04:33,550 the end of a changing file. 59 00:04:33,580 --> 00:04:40,840 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 60 00:04:40,990 --> 00:04:45,980 stands for copy file and vi is move or rename fine. 61 00:04:46,350 --> 00:04:51,180 And our MDI are for removing files and or directories. 6757