WEBVTT 00:09.120 --> 00:15.060 Hello friends welcome back in this lesson we're going to talk about group management in Linux in our 00:15.060 --> 00:19.980 previous lesson we learn how to manage users and their password in this lesson. 00:19.980 --> 00:25.710 We're going to talk about the group management group management is a way of managing different user 00:25.710 --> 00:26.680 accounts. 00:26.680 --> 00:27.080 OK. 00:27.240 --> 00:32.810 So this will be very helpful for an administrator who manages the users. 00:33.000 --> 00:40.270 You can set up particular priorities or you can also set up some file permissions from particular users 00:40.470 --> 00:43.020 and you can add them a particular group click. 00:43.320 --> 00:46.450 Let's understand this Witan basic example. 00:46.500 --> 00:50.390 Suppose you are an administrator of that school. 00:50.700 --> 00:57.660 And inside the school there are different categories of students means some student belong to physics 00:57.660 --> 01:00.370 groups some students belong to chemistry group. 01:00.420 --> 01:02.880 Some students belongs to biologic group. 01:02.990 --> 01:03.430 OK. 01:03.630 --> 01:10.980 So you can manage these students by creating the groups with the name biology physics and chemistry 01:11.250 --> 01:14.090 and add that students to live in groups. 01:14.100 --> 01:19.290 Ok this will be very easy for an administrator who manages the students. 01:19.470 --> 01:25.620 You can restrict the students from accessing some resources on your system. 01:25.740 --> 01:31.120 So how to restrict a particular resource that we can or talk about in an upcoming lesson. 01:31.350 --> 01:37.050 But for now just understand we're going to learn only how to create a group how to modify them and how 01:37.050 --> 01:37.990 to deliver them. 01:38.030 --> 01:38.280 OK. 01:38.280 --> 01:39.720 Inside this lesson. 01:39.930 --> 01:42.880 So let's see practically How good is. 01:43.320 --> 01:51.060 So to create a new group there is a common group and so was pseudo. 01:52.030 --> 01:53.950 And suppose I want to create a group. 01:54.180 --> 01:59.410 Felix Guenter Now the group is created. 01:59.790 --> 02:04.230 You can also set up a group ID with option. 02:04.230 --> 02:05.120 Hi Nancy. 02:05.300 --> 02:05.780 OK. 02:05.960 --> 02:11.840 And suppose I want to give you an ID want to read. 02:12.400 --> 02:23.630 And so now it says that on group is already exist so then the group name chemistry. 02:23.870 --> 02:27.090 Now our group chemistry is created. 02:27.190 --> 02:27.810 OK. 02:28.120 --> 02:30.060 Good idea one before. 02:30.380 --> 02:33.350 And also you can create this esteemed group. 02:33.500 --> 02:34.670 OK. 02:34.690 --> 02:40.600 So to create a system group you need to provide option Hypponen are key. 02:40.730 --> 02:43.310 So let's create a system. 02:43.740 --> 02:44.450 Biologic 02:49.220 --> 02:58.040 and heat and we know we have created three different groups with physics chemistry and biology. 02:58.210 --> 03:00.880 So how do you view these groups. 03:00.900 --> 03:07.510 So I'm going to show you directly where these groups group names are stored. 03:07.660 --> 03:18.190 So let's get inside BTC and group look at this file which is present inside the EDC folder contains 03:18.190 --> 03:23.780 all the information about the group like group name is ID. 03:23.860 --> 03:26.130 So hit enter. 03:26.150 --> 03:34.660 Now here you can see in the three groups that we have added are entered inside this file like physics 03:34.670 --> 03:42.910 Hoving group ID 1 0 1 7 chemistry's having the ID that we said next is 1 2 3 4 and biology's having 03:43.390 --> 03:46.040 the group id 9 9 7. 03:46.240 --> 03:52.900 So what is the difference in between the normal group and the system group that we have created with 03:52.900 --> 03:53.840 the name biology. 03:53.920 --> 04:03.550 So the difference is that you can set the group ID from 0 to 9 9 9 sistem group get and because these 04:03.550 --> 04:08.300 numbers are stored for sistem groups only and about 1000. 04:08.470 --> 04:16.570 All the group ids are applied to any group that you created which are non-test in groups so they knew 04:16.580 --> 04:23.750 what new users created by default on the name of his name your primary group. 04:23.820 --> 04:24.320 OK. 04:24.610 --> 04:28.130 So let's type. 04:28.360 --> 04:35.680 And here you can see the user name here is Prashant and with the name Prashant here a primary group 04:35.680 --> 04:38.020 is automatically created. 04:38.230 --> 04:38.680 OK. 04:38.710 --> 04:45.270 After adding the group let me show you how to modify the group so to modify the group there is a come 04:45.270 --> 04:51.490 on group more than you need proof of. 04:51.630 --> 04:54.310 And here you need to add a new name. 04:54.310 --> 05:03.480 Suppose I want to go into physics physics and here the old name is physics. 05:03.500 --> 05:04.930 Hit enter. 05:04.990 --> 05:09.510 Now let's get inside the file. 05:11.960 --> 05:17.410 OK and here you can see the physics name is changed to physics one. 05:17.440 --> 05:26.680 Get in this way you can modify the group name or you can modify the group ID here by providing the switch 05:27.120 --> 05:28.590 hyphen G. 05:29.320 --> 05:38.150 So here I want to modify the group ID to one tree of physics one who get hit enter. 05:38.200 --> 05:40.990 Now it's called the fly. 05:41.080 --> 05:45.400 And here you can see the group by this change to 2 to 1 3. 05:45.560 --> 05:52.850 OK in this way you can modify the group name and the group ID with the help of group more common. 05:52.960 --> 05:59.560 Now of the more inflamed the groups I show you how good reading the groups is so simple to remove the 05:59.560 --> 06:00.400 groups. 06:00.400 --> 06:12.560 This need to pro-white them on gal and the group name is X1 so we misspelled here the physics. 06:12.560 --> 06:14.170 So here it enter. 06:14.300 --> 06:17.370 And now we get inside the file. 06:20.200 --> 06:22.560 Pseudo. 06:23.190 --> 06:32.070 It is the group and here you can see the physics group is removed from this vine. 06:32.420 --> 06:38.030 In this way you can add a group you can modify and you can delete them. 06:38.210 --> 06:38.900 OK. 06:38.930 --> 06:44.710 With the help of these come ons there are some important files I want to show you here. 06:44.810 --> 06:47.000 Inside this is the folder. 06:47.020 --> 06:58.100 So was in the first file I already show you that is group OK which stores all information about a group 06:58.160 --> 07:00.370 like group name and the group. 07:00.590 --> 07:02.420 Very important information. 07:02.570 --> 07:05.560 Then after that there is a file for stability. 07:05.720 --> 07:06.190 OK. 07:06.440 --> 07:12.520 So this file stores the information about the usernames and the user ID. 07:12.560 --> 07:13.100 OK. 07:13.250 --> 07:18.290 Here you can see at the bottom these are the user names and that were added by me. 07:18.650 --> 07:24.510 So after this file there is another important file that is Shanno. 07:25.340 --> 07:32.120 So this schürrle file contains the possible information about all the users in the encrypted format. 07:32.120 --> 07:36.110 Here you can see the Student 1 and some exam. 07:36.190 --> 07:42.080 And Zahm one key is showing us the format in the format of the password. 07:42.530 --> 07:48.560 And after this there is another important file. 07:49.080 --> 07:56.120 This file contains information about the crooks get the shared information about the groups. 07:56.330 --> 08:03.790 So these are some of the important files which are very helpful for you because if some wrong users 08:03.820 --> 08:11.660 get information about these files and if you copied these files then he can easily decrypt the password 08:11.750 --> 08:14.810 and he can get access to your system OK. 08:15.020 --> 08:21.010 He can easily misuse your resources or he can hum to a system for it. 08:21.140 --> 08:23.880 So you need to protect these files. 08:24.080 --> 08:24.570 OK. 08:24.740 --> 08:30.290 So how to protect these files or hope to set up restrictions. 08:30.290 --> 08:33.050 We're going to learn about it in the upcoming lessons.