1 00:00:00,690 --> 00:00:02,520 There will be times in Linus where you create a file 2 00:00:02,520 --> 00:00:05,850 and maybe you forget where the directory was. 3 00:00:05,850 --> 00:00:07,620 Sometimes you need to find log files 4 00:00:07,620 --> 00:00:11,673 or locations of different commands, anything. 5 00:00:12,840 --> 00:00:14,760 Linux comes with a lot of different commands 6 00:00:14,760 --> 00:00:18,600 that will allow you to execute these searches. 7 00:00:18,600 --> 00:00:20,610 So the first one I want to look at is locate, 8 00:00:20,610 --> 00:00:22,200 just really quick. 9 00:00:22,200 --> 00:00:25,053 We're just trying to locate anything relative to backup. 10 00:00:27,510 --> 00:00:30,870 And we see it gives us a huge list 11 00:00:30,870 --> 00:00:34,770 of any file name that has the word backup in it. 12 00:00:34,770 --> 00:00:37,020 And there's different options with that, right? 13 00:00:37,020 --> 00:00:40,023 We can make sure that this is case insensitive. 14 00:00:41,040 --> 00:00:42,243 So do I. 15 00:00:44,760 --> 00:00:46,791 Another thing we can do is, 16 00:00:46,791 --> 00:00:49,320 make sure that we actually just get a count. 17 00:00:49,320 --> 00:00:50,823 We just want to know how many. 18 00:00:52,380 --> 00:00:54,660 Now it gives us a number there. 19 00:00:54,660 --> 00:00:56,850 Now, the one I'm going to focus on the most today 20 00:00:56,850 --> 00:00:58,530 is the find command. 21 00:00:58,530 --> 00:01:01,920 This is clearly the most powerful one of them all. 22 00:01:01,920 --> 00:01:06,000 This allows us to do any structure that we like. 23 00:01:06,000 --> 00:01:08,700 To locate, we can't pick the file directory 24 00:01:08,700 --> 00:01:09,533 that we're looking into, 25 00:01:09,533 --> 00:01:11,610 it's just going to search the whole system. 26 00:01:11,610 --> 00:01:13,020 This allows us to search, 27 00:01:13,020 --> 00:01:16,500 if we're looking for a type of directory, type of file, 28 00:01:16,500 --> 00:01:18,450 just a lot of different options for us. 29 00:01:20,340 --> 00:01:21,540 So you see on this one, 30 00:01:21,540 --> 00:01:24,120 we're looking for a directory with anything 31 00:01:24,120 --> 00:01:26,670 with the name log but only directories. 32 00:01:26,670 --> 00:01:28,830 So it starts from the route directory, 33 00:01:28,830 --> 00:01:31,770 and it recursively searches every sub-directory 34 00:01:31,770 --> 00:01:34,863 for anything with log, as a directory name. 35 00:01:36,180 --> 00:01:37,500 Next, we're going to do the same thing, 36 00:01:37,500 --> 00:01:39,840 but we're going to look for a file. 37 00:01:39,840 --> 00:01:41,970 Starting from the route directory, 38 00:01:41,970 --> 00:01:43,920 so we got to do the type, it's going to be file, 39 00:01:43,920 --> 00:01:45,370 that's what the F stands for, 40 00:01:46,230 --> 00:01:48,153 the name from the messages. 41 00:01:50,040 --> 00:01:52,440 And now we see we have a file named messages 42 00:01:52,440 --> 00:01:54,663 under the VAR log sub directory. 43 00:01:56,430 --> 00:02:00,240 We can also look up files by certain sizes. 44 00:02:00,240 --> 00:02:02,130 For example, we're going to use it one more time, 45 00:02:02,130 --> 00:02:04,410 but we're going to look up any file, 46 00:02:04,410 --> 00:02:06,450 in this particular file location, 47 00:02:06,450 --> 00:02:07,950 so we're going to use the VAR log, 48 00:02:07,950 --> 00:02:10,113 that's larger than a hundred kilobytes. 49 00:02:11,280 --> 00:02:12,483 Okay. So let's do this. 50 00:02:15,630 --> 00:02:17,130 Type: it's going to be a file. 51 00:02:18,390 --> 00:02:19,223 Strings. 52 00:02:24,300 --> 00:02:25,680 So this gives us complete list 53 00:02:25,680 --> 00:02:28,800 of every file that's larger than a hundred kilobytes. 54 00:02:28,800 --> 00:02:31,380 And now we can test this out just by making sure. 55 00:02:31,380 --> 00:02:33,483 So we'll, let's take this out, 56 00:02:35,250 --> 00:02:36,183 Make it readable. 57 00:02:42,270 --> 00:02:46,290 And now we see this particular file is 287 kilobytes. 58 00:02:46,290 --> 00:02:47,890 If you want to just test one more. 59 00:02:49,740 --> 00:02:50,763 For good measure. 60 00:02:53,580 --> 00:02:55,563 Again, this one is 321 kilobytes. 61 00:02:56,640 --> 00:02:58,950 Now, along with sizes, you're also able 62 00:02:58,950 --> 00:03:01,770 to search for things that have been updated 63 00:03:01,770 --> 00:03:04,230 within a certain amount of time passing. 64 00:03:04,230 --> 00:03:06,040 So we're going to look for a type 65 00:03:07,078 --> 00:03:09,828 of file that's been updated within the last 30 minutes. 66 00:03:10,710 --> 00:03:12,900 So again, we'll look in the same directory. 67 00:03:12,900 --> 00:03:15,663 Log for a file, 68 00:03:17,700 --> 00:03:19,710 and then we're going to look for right here 69 00:03:22,770 --> 00:03:23,793 30 minutes. 70 00:03:25,950 --> 00:03:28,110 So all of these files have been updated 71 00:03:28,110 --> 00:03:29,643 within the past 30 minutes. 72 00:03:31,230 --> 00:03:33,173 Again, we're just going to verify this. 73 00:03:34,680 --> 00:03:37,323 Look up for our log. 74 00:03:38,652 --> 00:03:40,143 Let's just do the secure. 75 00:03:41,850 --> 00:03:43,923 Now it's updated at 12:40. 76 00:03:45,000 --> 00:03:46,770 And if you look at the top of my screen, 77 00:03:46,770 --> 00:03:49,020 you'll see that it's currently 12:49, 78 00:03:49,020 --> 00:03:50,170 so that's within range. 79 00:03:51,180 --> 00:03:52,800 You can also look for an either 80 00:03:52,800 --> 00:03:55,620 or type of clause attached to this command. 81 00:03:55,620 --> 00:04:00,513 So we're going to look for a file in our log. 82 00:04:04,080 --> 00:04:05,580 We wanted it to either be zero 83 00:04:08,130 --> 00:04:13,130 or is sized to be greater than a hundred kilobytes, 84 00:04:16,649 --> 00:04:20,343 and last been updated within the last 30 minutes. 85 00:04:24,090 --> 00:04:27,600 So this search function accomplishes all of these, 86 00:04:27,600 --> 00:04:28,920 and we're just going to verify one of these. 87 00:04:28,920 --> 00:04:31,050 So I'm going to list this out really quick. 88 00:04:31,050 --> 00:04:35,580 The list command, use the VAR log, just file. 89 00:04:37,320 --> 00:04:39,090 And we can see this was one that's selected 90 00:04:39,090 --> 00:04:41,190 because it's an empty file. 91 00:04:41,190 --> 00:04:42,510 Again so we just went over a few 92 00:04:42,510 --> 00:04:44,580 of the search commands in Linux. 93 00:04:44,580 --> 00:04:47,400 Now the locate command requires the database to be updated 94 00:04:47,400 --> 00:04:50,550 in order to perform accurate searches, but the font is not. 95 00:04:50,550 --> 00:04:52,260 And the font also allows us 96 00:04:52,260 --> 00:04:54,210 to search particular directories. 97 00:04:54,210 --> 00:04:57,240 So it has a lot of advantages over the locate 98 00:04:57,240 --> 00:04:59,820 but the locate can be faster, but of course it 99 00:04:59,820 --> 00:05:04,820 won't represent the entire disc versus the find command. 100 00:05:05,250 --> 00:05:07,050 And I'll see you in the next lesson.