WEBVTT 00:01.360 --> 00:08.620 As you have seen in previous examples, by default, the LHS command lists all the Non-hidden directory 00:08.620 --> 00:08.980 files. 00:08.980 --> 00:15.130 So sometimes this can be overkill, especially when you're just looking for information on a few files. 00:15.130 --> 00:22.210 So fortunately, the LHS command also provides a way for you to define a filter on the command line. 00:22.210 --> 00:29.140 So it uses the filter to determine which files or directories it should display in the output. 00:29.140 --> 00:36.700 So before using the filter command here, let's create some files to play with the via touch command 00:36.700 --> 00:36.940 here. 00:36.940 --> 00:40.720 So which you will learn touch command in more detail in next lecture. 00:40.720 --> 00:43.180 So let's actually by creating touch here. 00:43.180 --> 00:46.450 So let's create our file names. 00:46.450 --> 00:48.730 So my file. 00:50.810 --> 00:54.080 Uh, Oxley Academy. 00:56.150 --> 00:58.790 My document. 01:00.850 --> 01:02.710 Just a picture. 01:03.490 --> 01:04.570 And yeah, that's. 01:04.570 --> 01:07.090 I think that's okay enough. 01:07.360 --> 01:07.870 Yeah. 01:07.870 --> 01:13.960 And here and as you can see here, just the picture, my document, my file and Excel Academy is created 01:13.960 --> 01:14.440 here. 01:14.440 --> 01:17.500 So now let's actually create another. 01:19.080 --> 01:21.160 And another file, too. 01:21.180 --> 01:22.430 So torch. 01:25.800 --> 01:27.810 And in order to do that. 01:27.810 --> 01:34.470 So let's actually create the fall fell fill and full here. 01:34.560 --> 01:38.370 We also created this and fall fill, fill and full. 01:38.610 --> 01:44.010 So the filter command works as simple text matching strings. 01:44.010 --> 01:51.090 So include the filter after any command line parameters you want to use like this for here, for example, 01:51.090 --> 01:53.460 in this case we're going to use the long here. 01:53.460 --> 01:57.930 So now we're going to create, for example, my file here, right? 01:57.930 --> 01:59.640 My file. 02:00.780 --> 02:08.820 And as you can see here, we specified the name of the specific file as the filter. 02:08.820 --> 02:12.990 So the command only shows this file information. 02:12.990 --> 02:17.550 Sometimes you might not know the exact file name you're looking for. 02:17.550 --> 02:24.420 And the LS command also recognized standard wildcard characters and uses them to match patterns with 02:24.420 --> 02:25.080 the filter. 02:25.080 --> 02:25.690 So. 02:25.690 --> 02:29.650 So a question mark here represents one character. 02:29.650 --> 02:33.610 So ls a question mark represents one character here. 02:33.610 --> 02:35.440 So you can do like this. 02:36.070 --> 02:37.960 Let's actually create. 02:38.860 --> 02:43.420 So here, let's actually open our marker. 02:43.450 --> 02:44.350 Oops, Sorry. 02:45.650 --> 02:46.300 Yeah. 02:46.310 --> 02:49.930 Let's open our marker here. 02:49.940 --> 02:50.950 Yeah, Gromit. 02:50.960 --> 02:55.130 And now I want to write something on here. 02:55.130 --> 02:59.960 So firstly, as we created our files, we have file. 03:00.090 --> 03:00.620 File. 03:00.620 --> 03:01.880 Firstly, file. 03:02.740 --> 03:04.570 So then we have fell. 03:06.680 --> 03:08.900 And then we have Phil. 03:11.570 --> 03:14.660 And also lastly, we have full here. 03:16.180 --> 03:24.700 So let's actually what these characters and the sentences has common is that they always start with 03:24.700 --> 03:27.450 F and the last character. 03:27.460 --> 03:30.220 Last character is always l l here. 03:30.220 --> 03:35.530 So in this case, if we want to filter this, we can also do this. 03:35.530 --> 03:38.320 For example, let's yes here. 03:38.320 --> 03:41.080 So let's create a new file. 03:41.080 --> 03:43.360 In order to do that, we're going to do. 03:44.660 --> 03:45.140 Yeah. 03:45.350 --> 03:46.760 LZ, L here. 03:46.850 --> 03:47.190 Oops. 03:47.570 --> 03:49.710 LZ LSL. 03:49.730 --> 03:54.560 And as you can see here, we have file fill, full fill and other documents here. 03:54.560 --> 04:02.180 So if you want to just print those files, we need to do LZ here, Clear LSL. 04:02.180 --> 04:07.850 So we're going to we're going to do here ls l f question mark. 04:08.650 --> 04:11.170 And fill or LL here. 04:11.170 --> 04:14.620 And as you can see, here we are. 04:14.620 --> 04:19.240 This question mark, as I said earlier, is represents one character. 04:19.240 --> 04:21.400 So this question mark represents one character. 04:21.490 --> 04:22.330 We don't know. 04:22.330 --> 04:25.720 But we want to search these terms here, as you can see here. 04:25.720 --> 04:29.530 So here we added the question mark here. 04:29.530 --> 04:40.510 So we added here f question mark and LL So this tells us that start with start for characters that start 04:40.510 --> 04:46.240 with the F and end with the last two characters has two L's on it. 04:46.240 --> 04:49.240 So we just want to filter this here. 04:49.360 --> 04:53.920 So we also have the asterisks to represent any number of characters. 04:54.640 --> 04:59.830 But here, for example, we can also do let's actually delete this. 04:59.830 --> 05:01.210 Yeah, we can also. 05:01.210 --> 05:09.430 So here we had the my file, my document, just the picture and let's create another here touch ox and 05:09.430 --> 05:10.960 my Oxley. 05:12.200 --> 05:13.010 Pouch. 05:14.350 --> 05:18.620 Touch my Linux and LZ here. 05:18.630 --> 05:19.350 Clear. 05:19.380 --> 05:24.300 Firstly, LZ, and as you can see here, my document, my file, my Linux, my Excel. 05:25.020 --> 05:28.350 So in order to do that, we're going to do here. 05:28.920 --> 05:30.500 LZ Oops. 05:30.510 --> 05:32.690 Yeah, LZ, L here. 05:32.700 --> 05:35.100 So we're going to do so, as you know, here. 05:35.100 --> 05:38.460 So we have the my. 05:39.760 --> 05:41.200 My document. 05:45.780 --> 05:48.840 Also we have here my file. 05:54.590 --> 05:56.810 Also we have my Linux. 06:01.950 --> 06:03.750 Also lastly my Oxley. 06:10.060 --> 06:10.720 Here. 06:10.720 --> 06:17.500 So now in order to search these files, as you can see here with the LSL command, we got like a wide 06:17.740 --> 06:18.790 range of files. 06:18.790 --> 06:24.310 But if we want to filter these files and the filter, that's. 06:25.200 --> 06:29.840 Filter names that start with the my here m I or other characters. 06:29.850 --> 06:31.530 We're going to do just this here. 06:31.530 --> 06:40.350 So let's get here and we will do my and this asterisk and here it will show us files that start with 06:40.350 --> 06:47.730 my so we can also do that with this here so lsl f and asterisk instead of here. 06:47.730 --> 06:50.640 And as you can see here, we got the same result. 06:51.510 --> 06:53.770 But actually, these are not the same. 06:53.790 --> 07:03.540 Of course, if, for example, let's create another file, touch file fail, and here we will enter 07:03.540 --> 07:04.950 our old command. 07:04.950 --> 07:06.150 So clear. 07:06.300 --> 07:07.230 Clear. 07:08.040 --> 07:12.030 LSL And as you can see, we have failed fall field. 07:13.640 --> 07:15.020 Fill and full. 07:15.020 --> 07:16.550 And here we're going to do. 07:18.420 --> 07:26.400 Yeah, we will do the previous comment here F and here WL here and as you can see we don't we don't 07:26.400 --> 07:32.250 see our fail here because fail last two characters is not WL here. 07:32.250 --> 07:34.890 So that's it with our example here. 07:34.980 --> 07:41.280 In next lecture I will the talk about the handling and creating files in Linux. 07:41.280 --> 07:42.390 So see you later.