WEBVTT 00:09.330 --> 00:15.760 Hello friends welcome back in this lesson we're going to talk about existentialists in Linux in our 00:15.790 --> 00:21.220 previous lesson we learn how to manage the permissions with the help of more. 00:21.220 --> 00:22.140 Come on OK. 00:22.270 --> 00:25.420 We learn how to set them or how to remove them. 00:25.540 --> 00:29.470 But that combined is having some limitations. 00:29.470 --> 00:36.200 Suppose you how file or a directory and there are 10 other users. 00:36.390 --> 00:36.850 OK. 00:37.030 --> 00:44.860 And you set the reading permission for other users for that file or folder and you want few of them 00:45.100 --> 00:47.310 how the right permission to. 00:47.470 --> 00:50.720 So you can do this thing with that. 00:50.720 --> 00:52.000 See it's more common. 00:52.030 --> 00:52.610 OK. 00:52.750 --> 01:00.760 So to overcome such limitations solve this previous technique the Access Control List is interested 01:01.210 --> 01:01.980 in Linux. 01:02.040 --> 01:07.810 OK so let's see how Access Control list can be implemented practically. 01:08.430 --> 01:09.140 OK. 01:09.190 --> 01:16.580 In some Linux operating systems you need to remount the file system with Ethereal so you can remount 01:16.580 --> 01:17.050 it. 01:17.070 --> 01:22.780 What is it in the stuff file which is located in the location in. 01:22.930 --> 01:31.540 So this type vi it is an office of ogee here. 01:31.760 --> 01:36.720 What you need to do is you just need to go here. 01:36.920 --> 01:38.340 Here it is. 01:38.340 --> 01:42.840 And so you need to add such entry into your file. 01:42.980 --> 01:47.860 So by pressing I you can it like this. 01:47.990 --> 01:56.310 And by Skip give colon right you like this you can write into it. 01:56.480 --> 02:00.160 And after that what do you need to do is just type go 02:03.200 --> 02:07.230 all up and forward slash. 02:07.270 --> 02:13.940 That is the root directory and again to not file system is remounted. 02:14.150 --> 02:17.840 So in this way you can get better in this word. 02:17.930 --> 02:26.210 You don't need to do this but I show you here because some systems are some older system need to do 02:26.210 --> 02:28.050 this or need to Ramond this. 02:28.100 --> 02:28.510 OK. 02:28.770 --> 02:36.500 So after a remounting there is a come on call is everything with the help of which we can set in the 02:36.990 --> 02:37.740 woods. 02:37.790 --> 02:39.390 Our mission is quantified. 02:39.490 --> 02:39.970 OK. 02:40.070 --> 02:43.050 So first of all let's create a file. 02:43.490 --> 02:45.690 It's done. 02:46.290 --> 02:47.140 You got x. 02:47.200 --> 02:56.160 The only way to get if you can see or test its attributes is your mission. 02:56.220 --> 03:00.760 So you don't you got the X. 03:01.040 --> 03:06.650 Now here you can see it reveals the current permissions OK for the file. 03:06.650 --> 03:10.650 So here you can see audio uses harrying on mission. 03:10.820 --> 03:11.240 OK. 03:11.450 --> 03:14.420 So are other users having a critical mission. 03:14.420 --> 03:18.140 So in my system there is a user bog. 03:18.140 --> 03:22.550 So let's see what happens when I try to edit this file. 03:22.610 --> 03:24.090 You can use it to dog 03:27.760 --> 03:30.250 no why. 03:30.380 --> 03:37.980 Student got 60 million here and see this as a warning it is a read only file. 03:38.380 --> 03:39.860 When I try to do that 03:46.890 --> 03:48.950 OK it shows an error here. 03:51.220 --> 03:57.450 In this way you can write the data to that file so you can get this by typing. 03:57.800 --> 04:05.720 You can force it to quick like this and now we see Bob hon. 04:05.820 --> 04:06.870 You did a fine. 04:07.040 --> 04:08.820 So did Bob. 04:08.820 --> 04:11.240 And here is the file. 04:11.240 --> 04:11.860 OK. 04:12.020 --> 04:17.780 So it is here now I'm going to send the right permission to the box. 04:18.140 --> 04:20.460 So just right here. 04:20.550 --> 04:30.950 If Israel then modify it and then use it because we need to give permission for use of Bob's So here 04:31.450 --> 04:40.760 the user name then colon and the politician that is right and the filing student party is the OK. 04:41.110 --> 04:43.450 It says no such files are to be read. 04:43.630 --> 04:44.220 OK so. 04:44.240 --> 04:46.060 Student who got the ax. 04:46.310 --> 04:46.750 OK. 04:46.880 --> 04:49.720 Now let's switch to bobbling 04:52.650 --> 04:55.160 want to go. 04:55.220 --> 04:56.060 Yes. 04:56.710 --> 04:58.040 OK. 04:58.940 --> 05:00.770 Here in the file. 05:00.780 --> 05:02.530 No this is two days 05:05.520 --> 05:06.350 on this 05:09.360 --> 05:12.720 let's try and see civic 05:16.800 --> 05:23.000 Let's see the data that he's got to go to you. 05:23.450 --> 05:23.670 OK. 05:23.670 --> 05:27.930 Here you can see the data is added to the fine. 05:27.990 --> 05:34.450 So in this way you can see the permission for other users according to your needs. 05:34.590 --> 05:42.980 So you can use specific permissions with the help of access control list and you can just hear like 05:42.990 --> 05:51.970 Suppose the exit from God can we here you can see venue and access control list or the permissions access 05:51.990 --> 05:55.540 control less than the plus sign is get added. 05:55.680 --> 05:55.990 OK. 05:55.990 --> 05:57.050 Here at the end. 05:57.120 --> 05:57.490 OK. 05:57.600 --> 06:01.440 In this way you can add the access control lists. 06:01.710 --> 06:05.080 You can also add this control list group. 06:05.160 --> 06:06.950 You just need to replace this. 06:06.950 --> 06:08.020 You did. 06:08.270 --> 06:09.740 And here Bob. 06:09.750 --> 06:11.030 Name the group name. 06:11.030 --> 06:15.340 And here you can set the permissions that you want. 06:15.450 --> 06:17.040 You can add it to the group. 06:17.280 --> 06:26.740 OK after reading this permission Let's see what happens with the help of the student Guga XTi enter. 06:26.970 --> 06:31.270 And here you can see user Bob is get added here. 06:31.560 --> 06:37.680 As a user looking for this find and it is having a really great access. 06:37.680 --> 06:43.990 So after having the commission Let me show you what happens in some directories. 06:44.180 --> 06:44.800 OK. 06:44.850 --> 06:47.870 So first of all let's create a directory 06:51.100 --> 06:51.680 no. 06:51.910 --> 06:55.330 Let's see the core missions for Joe. 06:55.750 --> 06:56.450 OK. 06:56.510 --> 07:01.170 Here you can see for all the users will give you an exact permission is there. 07:01.170 --> 07:04.350 So there is no write permission for this correctly. 07:04.370 --> 07:08.300 That means all the users can create a file or they reconcile that. 07:08.540 --> 07:15.680 So let's switch to Bob on that side. 07:15.890 --> 07:17.440 OK now we are inside Joe. 07:17.660 --> 07:23.790 And then I can click a directory something like this so it says permission denied because we don't know 07:23.800 --> 07:28.400 how the right mission for this directory as other users. 07:28.400 --> 07:31.910 So that's why we can create any file or directly inside it. 07:32.090 --> 07:37.580 So let's have the permission for a ball here. 07:37.840 --> 07:44.520 The user will read write execute on these. 07:45.060 --> 07:48.200 OK and no switches. 07:51.760 --> 07:57.340 No good side to make directly as. 07:57.510 --> 08:05.490 Ok fine as both the file and directory has been created here. 08:05.670 --> 08:06.240 OK. 08:06.320 --> 08:12.310 In this way you can add the files and directories of applying blind Zegerid permissions need the help 08:12.310 --> 08:14.350 of set up. 08:14.620 --> 08:17.280 So now we don't have the permission. 08:17.640 --> 08:23.440 OK so you remove the users from the Access Control list. 08:23.980 --> 08:31.340 So you can also remove the users from this list or you can remove the permissions to remove the permission 08:31.340 --> 08:34.490 and you just need to type for next. 08:34.500 --> 08:38.190 And then the user name Bob. 08:38.440 --> 08:43.960 And after that the file the student could not get here. 08:44.380 --> 08:47.100 So the body is removed as user. 08:47.390 --> 08:48.010 OK. 08:48.010 --> 08:55.470 So let's see what happens and get you to the city. 08:55.500 --> 09:00.310 And now here you can see there is no user presence here has. 09:00.580 --> 09:00.920 OK. 09:00.940 --> 09:03.240 The user is removed from the list. 09:03.250 --> 09:08.710 You can add multiple users for a file with the help of said of Israel. 09:08.920 --> 09:09.340 OK. 09:09.460 --> 09:13.960 And if you want to remove all the permissions I suppose. 09:13.960 --> 09:17.260 Here you can see the mosque where mission is also there. 09:17.340 --> 09:17.650 OK. 09:17.680 --> 09:25.430 The mosque is there so if you want to remove all the permissions at a time from a file that is set mid-set 09:25.490 --> 09:34.710 official then just the command then hyphen B and the file or the folder name and hit enter. 09:34.780 --> 09:40.270 Now get this student. 09:40.540 --> 09:46.300 And here you can see the mosque permission is get removed from this gate. 09:46.420 --> 09:54.190 So in this way you can play with Access Control list and make a more flexible way of providing the security 09:54.190 --> 09:56.360 for your files or folders. 09:56.360 --> 09:56.800 OK.