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These are the user uploaded subtitles that are being translated: 1 00:00:00,820 --> 00:00:02,020 All right let's continue. 2 00:00:02,200 --> 00:00:07,060 We've seen so far how we can see the content of folders and how we can create fights but we haven't 3 00:00:07,060 --> 00:00:10,440 seen yet how we can see the contents of fights. 4 00:00:10,510 --> 00:00:15,090 Here is the explanation for the section on every Linux system. 5 00:00:15,120 --> 00:00:21,910 There's a hidden file called the bash history and this file retains the last five hundred commands executed 6 00:00:21,910 --> 00:00:23,470 by any user. 7 00:00:23,470 --> 00:00:29,010 It usually is in the user's home that actually and one of the things you want to do after the exploit 8 00:00:29,010 --> 00:00:34,360 the Linux machine is look at the content of this fight because it gives you a very good idea of what 9 00:00:34,360 --> 00:00:39,490 this user has been up to what have they been creating and what they've been interacting with. 10 00:00:39,490 --> 00:00:45,940 So going to be using this file as our example for the section we're going to be looking at the cat commands 11 00:00:46,360 --> 00:00:52,720 which is short for concatenate the gap can display the contents of a file in one go. 12 00:00:52,720 --> 00:00:57,190 We're also going to be looking at the less command which is a little bit more efficient than the cat 13 00:00:57,220 --> 00:00:58,470 commands. 14 00:00:58,510 --> 00:01:02,310 And I'm going to let you on your own try to head and take commands. 15 00:01:02,440 --> 00:01:11,980 So let's see how this looks like I'm doing him S1 is a remember the mind shows me all files including 16 00:01:11,980 --> 00:01:16,220 the hidden ones and the L is the long listing. 17 00:01:16,330 --> 00:01:17,000 And here we go. 18 00:01:17,000 --> 00:01:20,700 This is my batch file and see this dot for the bash history. 19 00:01:20,700 --> 00:01:24,040 This indicates that this is a hidden file. 20 00:01:24,040 --> 00:01:31,750 This is why I needed to use the l s why it has a right to view the content of this file using the cat's 21 00:01:31,850 --> 00:01:35,190 command type cat and the name of the file. 22 00:01:36,790 --> 00:01:37,760 And here we go. 23 00:01:37,780 --> 00:01:41,130 These are all the commands that I've been typing so far. 24 00:01:41,290 --> 00:01:47,260 You can recognize some of them when we're doing the Ls on the temp directory and it's 192. 25 00:01:47,650 --> 00:01:55,360 And I can just scroll up and down to see the previous commands that I've been using earthing is. 26 00:01:55,380 --> 00:02:00,260 Sometimes you log into systems remotely and you don't have the option of a scroll. 27 00:02:00,260 --> 00:02:03,960 You can just scroll up and down using your mouse on the sidebar. 28 00:02:04,200 --> 00:02:06,030 So what do you do in this case. 29 00:02:06,180 --> 00:02:14,340 You can use instead the shift page up or page down to move up one page or down one page. 30 00:02:14,350 --> 00:02:15,740 All right this is perfect. 31 00:02:15,930 --> 00:02:20,940 But sometimes you might want to view the file that's a little bit too big and it catechumen might not 32 00:02:20,940 --> 00:02:27,450 be that efficient scrolling up pages and down pages and getting lost and all that go with all that content 33 00:02:27,780 --> 00:02:29,390 might be a bit inefficient. 34 00:02:29,670 --> 00:02:32,090 So what's a more efficient way to do that. 35 00:02:32,280 --> 00:02:34,760 They'll be using the less commands. 36 00:02:34,920 --> 00:02:35,570 Let's try that. 37 00:02:35,580 --> 00:02:36,770 I'm going to do less. 38 00:02:36,810 --> 00:02:38,310 Bash history. 39 00:02:38,310 --> 00:02:42,870 Now what this does is that it displays the top of the foot and it just stops it. 40 00:02:43,140 --> 00:02:47,280 If I want to navigate the file there are many options that I can use. 41 00:02:47,280 --> 00:02:54,120 I could just go down one line or up one line using the arrow keys or I can go down one page using the 42 00:02:54,120 --> 00:03:00,990 space scheme or I can go up and down full pages using the page up and page down. 43 00:03:02,310 --> 00:03:06,720 And when I'm done I can hit the q key to wit. 44 00:03:07,230 --> 00:03:14,370 So there was a difference between cabbed and less one command that you can also use the day quick sneak 45 00:03:14,370 --> 00:03:19,620 peek into files that say you want to verify that this is the file that you want before you start working 46 00:03:19,620 --> 00:03:21,800 on it but you don't want to open the whole fight. 47 00:03:21,930 --> 00:03:22,440 What do you do. 48 00:03:22,440 --> 00:03:28,610 You can use a command like the head's commands the head command shows you the first ten lines of a fight. 49 00:03:28,890 --> 00:03:30,680 And this is what it looks like. 50 00:03:30,720 --> 00:03:32,860 Can you guess what the command does. 51 00:03:33,030 --> 00:03:34,720 Let you try that one on your own. 5365