1 00:00:00,730 --> 00:00:03,310 Hello and welcome back to this lesson. 2 00:00:03,670 --> 00:00:10,600 So in this video, we're going to see some of the user information and management commands that are 3 00:00:10,600 --> 00:00:13,060 used in Linux operating system. 4 00:00:13,630 --> 00:00:14,080 All right. 5 00:00:14,080 --> 00:00:18,190 To begin with, the first command that we are going to see is the ID command. 6 00:00:18,670 --> 00:00:23,950 Now, this command displays the user and group IDs of your current user. 7 00:00:24,100 --> 00:00:28,030 Let us see the output and you can see the user ID is root. 8 00:00:28,060 --> 00:00:32,410 Group ID is root and the groups into this computer is root. 9 00:00:32,770 --> 00:00:38,740 Now, if you are logged in with another user, you will be able to see a different user ID, a different 10 00:00:38,740 --> 00:00:41,260 group ID and different set of groups. 11 00:00:42,160 --> 00:00:44,050 All right, let's move ahead. 12 00:00:44,410 --> 00:00:48,100 Now, the second command is the command, which is last. 13 00:00:48,310 --> 00:00:52,750 So you just have to write last and hit enter this command display. 14 00:00:52,780 --> 00:01:00,730 The last users who have logged in into the system and you can see the name of the users here, the user 15 00:01:00,730 --> 00:01:01,480 is root. 16 00:01:01,600 --> 00:01:03,820 After that, it was a system reboot. 17 00:01:04,330 --> 00:01:07,840 The user admin has also logged in into this computer. 18 00:01:07,870 --> 00:01:13,730 Similarly, you can see the different users that have logged in into this computer. 19 00:01:13,750 --> 00:01:22,690 Here is a user which is wolf, admin, root, etc. So by typing the command last you are able to see 20 00:01:22,690 --> 00:01:26,500 the last users who have logged in into the operating system. 21 00:01:27,280 --> 00:01:27,970 Perfect. 22 00:01:28,300 --> 00:01:34,660 Now, in case you want to see who is logged in currently into the system, you can simply type the command 23 00:01:34,660 --> 00:01:36,550 who and hit enter. 24 00:01:36,700 --> 00:01:41,680 And you can see we are logged in with the current user which is root. 25 00:01:42,490 --> 00:01:43,090 Perfect. 26 00:01:43,750 --> 00:01:44,740 Moving ahead. 27 00:01:45,280 --> 00:01:52,270 If you want to show who is logged in and what they are doing currently, you can simply type W and you 28 00:01:52,270 --> 00:01:57,380 can see the current user which is logged in as a root as you can see. 29 00:01:57,400 --> 00:02:02,740 Log in, idle CPU, CPU and what they are currently doing. 30 00:02:02,890 --> 00:02:08,440 So this command displays the current logged in user and the task that has been performed. 31 00:02:09,330 --> 00:02:13,530 Now in case you want to create a group. 32 00:02:13,530 --> 00:02:17,730 So let's see that how you can create a group or a user. 33 00:02:18,030 --> 00:02:26,580 So let me just clear the screen and let's say we make a new group that is group ADD and the group name 34 00:02:26,580 --> 00:02:27,900 is Test. 35 00:02:29,320 --> 00:02:33,790 Now when I hit enter, a group has been successfully created. 36 00:02:34,180 --> 00:02:43,960 Now let's say we want to add a user with a comment of John Smith and let's create the user's home directory 37 00:02:43,960 --> 00:02:44,670 as well. 38 00:02:44,680 --> 00:02:47,350 So for that we are going to add a user. 39 00:02:47,350 --> 00:02:55,390 So the command is user add hyphen C and let's give it a name as John Smith. 40 00:02:56,870 --> 00:03:01,640 And hyphen M and let's type it as John. 41 00:03:02,990 --> 00:03:07,680 And when I hit enter you can see it says the user. 42 00:03:07,700 --> 00:03:09,930 John already exists. 43 00:03:09,950 --> 00:03:12,330 All right, so let's delete the user for that. 44 00:03:12,350 --> 00:03:19,060 You need to type the command, which is user DEL, which means delete and the name of the user. 45 00:03:19,250 --> 00:03:20,960 So now it's deleted. 46 00:03:21,140 --> 00:03:27,350 Now let's execute this command again and you can see the user has been added successfully. 47 00:03:27,560 --> 00:03:31,940 Now, how to verify if the user has successfully been added. 48 00:03:32,030 --> 00:03:34,460 Simply go to this directory. 49 00:03:34,460 --> 00:03:35,120 Which is. 50 00:03:35,830 --> 00:03:44,440 Cat slash Etsy slash pass WD and hit enter and you can see the latest user which has been successfully 51 00:03:44,440 --> 00:03:53,950 added is John and you can see over here this is the directory of John and home slash. 52 00:03:55,020 --> 00:03:57,630 Here is John. 53 00:03:58,140 --> 00:04:02,940 These are the other users which have been added into this computer. 54 00:04:03,330 --> 00:04:05,940 So now we saw how to add a user. 55 00:04:06,120 --> 00:04:08,610 We saw how to delete a user. 56 00:04:08,970 --> 00:04:12,660 We also saw how to create a group of that user. 57 00:04:12,870 --> 00:04:20,720 Now let's add John account to a specific group, which is suppose sales group. 58 00:04:20,730 --> 00:04:24,480 So for that, we are going to write this command. 59 00:04:24,780 --> 00:04:35,130 Let me just clear the screen, which is user mod, user modify, modify the group to sales of the user, 60 00:04:35,130 --> 00:04:36,570 which is John. 61 00:04:36,990 --> 00:04:40,980 And you can see it says group sales does not exist. 62 00:04:40,980 --> 00:04:43,860 So we have created a group that was test. 63 00:04:43,860 --> 00:04:50,700 So let's see if you are able to add this user to a group which is test and it looks perfect. 64 00:04:50,970 --> 00:04:54,450 Now let us see the user details, which is. 65 00:04:55,950 --> 00:04:59,990 And slash etsy slash pass w rd. 66 00:05:00,000 --> 00:05:05,790 And here you can see the user which is John and the details about it. 67 00:05:05,820 --> 00:05:10,230 Now let's quickly switch the user to John. 68 00:05:10,920 --> 00:05:16,410 So switch user John and now I'm switched to the user, which is John. 69 00:05:16,530 --> 00:05:19,420 Let's verify using the command, which is who am I? 70 00:05:19,440 --> 00:05:24,060 And you can see the current logged in user is John. 71 00:05:24,090 --> 00:05:27,510 Let us type the command ID and an ID. 72 00:05:27,540 --> 00:05:34,220 You can see the user ID is John, the group ID is John and the groups which the user has been added 73 00:05:34,230 --> 00:05:35,280 is test. 74 00:05:35,640 --> 00:05:37,430 I hope you guys understood this. 75 00:05:37,440 --> 00:05:45,270 This is very, very simple yet very important to know how you can add a user, delete a user, and add 76 00:05:45,270 --> 00:05:47,910 that user to a specific group. 77 00:05:48,030 --> 00:05:48,780 Thank you.