WEBVTT 00:08.770 --> 00:13.680 Hello friends in this lesson we're going to talk about process management in Linux. 00:13.710 --> 00:17.880 So what are processes or what is a process. 00:17.880 --> 00:27.520 Any program that runs in the computer memory is coloniser process so processes are of two types. 00:27.540 --> 00:32.850 Number one it's achromatic process and the number two is interactive process. 00:32.950 --> 00:39.290 The metric processes are those processes which are started by the system during boot time. 00:39.450 --> 00:39.870 OK. 00:40.050 --> 00:48.130 Can the interactive processes are those processes which are started by or executed by the user. 00:48.270 --> 00:48.730 OK. 00:48.910 --> 00:55.650 On the command or the program that you start from the shell Arkan's in the category of incorrect two 00:55.770 --> 00:56.670 processes. 00:56.880 --> 00:57.430 OK. 00:57.640 --> 01:05.370 So as a Linux system administrator it is your job to make sure that your system runs correctly and gives 01:05.370 --> 01:06.650 a better performance. 01:06.660 --> 01:07.190 OK. 01:07.530 --> 01:15.360 So in this lesson I would like to show you three or four commands with the help of which you can monitor 01:15.360 --> 01:21.930 the processes and their status or you can also view the SIP you activities. 01:21.930 --> 01:29.800 So let's see practically how good this OK for first on that I would like to show here is because we 01:30.010 --> 01:35.870 use Kamani you can view the list of processes that are running on your system. 01:36.020 --> 01:43.880 So let's take this and hit enter and here you can see it shows two processes are running and it shows 01:43.880 --> 01:45.350 that process IDs. 01:45.430 --> 01:45.980 OK. 01:46.100 --> 01:49.440 So the process IDs are very important for us. 01:49.430 --> 01:56.330 OK we're going to learn about it later but for now just remember it is useful information with this 01:56.350 --> 02:03.800 come on you can try different cities like if you are try hyphen even it will list all the processes 02:03.890 --> 02:05.360 running on your system. 02:05.470 --> 02:06.020 OK. 02:06.170 --> 02:16.580 Like this or you can view them one by one with this option like this by hitting enter you can view each 02:16.580 --> 02:23.910 process one by one like this or by passing if when and if when you pass. 02:24.080 --> 02:29.440 Then it will list all the processes in full format like this. 02:29.570 --> 02:30.500 OK. 02:30.660 --> 02:38.730 And then you provide and then it will list all the processes in long listing like this. 02:38.880 --> 02:39.450 OK. 02:39.710 --> 02:47.160 In this way you can try these switches with it and get a lot of information or better information OK. 02:47.210 --> 02:54.500 The next which is X when you pass x then it will show the running processes. 02:54.500 --> 02:58.330 In short as the state get shot be because this. 02:58.550 --> 03:07.580 And when you parse you X then it will show all the processes in Long Beach the format like this. 03:08.030 --> 03:15.050 And you can track a particular user information here means which processes are initiated by the user 03:15.170 --> 03:23.680 with the help of these people come on like this just need to provide for you and username. 03:23.990 --> 03:29.000 And here you can see these are the processes which are started by me. 03:29.030 --> 03:31.860 OK which is the in user here. 03:32.120 --> 03:39.500 So in this way you can track your users means which processes that are running or what are they actually 03:39.500 --> 03:41.030 doing on the system. 03:41.170 --> 03:41.720 OK. 03:41.920 --> 03:48.100 In this way you can use the command OK and get certain useful information. 03:48.500 --> 03:51.690 The next command that I would like to show is Bob. 03:51.890 --> 03:54.720 So let's see what it reveals. 03:54.870 --> 04:02.330 The top command explains everything and that which is very important information about the processes. 04:02.630 --> 04:04.550 So let's see one by one here. 04:04.970 --> 04:07.440 What this all shows to us. 04:07.610 --> 04:16.670 OK let's talk about the first row the first row reveals about the uptime of this system or the server. 04:17.060 --> 04:22.340 Ok here you can see the snow is running since last eight hours and 35 minutes. 04:22.370 --> 04:28.540 We'll get the next part shows the number of users that are currently logged in here. 04:28.610 --> 04:31.640 Only one user is here on the system. 04:31.820 --> 04:33.880 OK the next part is leverage. 04:33.920 --> 04:41.060 It is the most important part here and the value here is the number of processors that reverting to 04:41.060 --> 04:43.190 be handled by the CPA. 04:43.460 --> 04:44.140 OK. 04:44.570 --> 04:49.460 Next explain the information about the tasks that are running here conceived. 04:49.490 --> 04:53.180 It shows the total number of past that is 122. 04:53.390 --> 04:59.870 Of course that one is running and the rest 121 are in sleeping mode. 04:59.870 --> 05:03.430 The next part explain the stop the pass out of that. 05:03.440 --> 05:12.520 So here zero cost us stop and the next part explains those zombie processes or the Zombie Dust. 05:12.530 --> 05:15.080 So what is Zombi process. 05:15.170 --> 05:23.350 Any process that is stopped but it unable to get to its existence stood by patent process. 05:23.360 --> 05:26.540 So such processes are colorize the zombie process. 05:26.550 --> 05:30.750 So here are those zeroes on the processing side on the system. 05:30.800 --> 05:33.970 So let's talk about the next floor that is CPQ. 05:34.310 --> 05:38.110 So the first part is yes that is userspace. 05:38.180 --> 05:42.710 It shows the involvement of the CPQ in the user activities. 05:43.060 --> 05:47.960 OK the next part is yes why that is activity in system space. 05:48.050 --> 05:53.600 That is it shows here thirty one point seven and its constantly changing. 05:54.200 --> 06:02.690 So despite rigorous security within systems space the next part is and I saw the value here indicates 06:02.690 --> 06:07.860 the amount of time spent by the CPQ on low priority processes. 06:08.090 --> 06:12.690 Okay the next part is ID that leads to inactivity. 06:12.800 --> 06:19.370 This part explains that the interactivity of the C.P. you saw the greater than them were here. 06:19.370 --> 06:24.580 That means you are system is doing nothing in the next part is W.J.. 06:24.800 --> 06:32.390 So value here indicates the amount of time you see you working for the input for example the input output 06:32.390 --> 06:37.840 hardwares that are according to a system like this keyboard mouse again. 06:38.180 --> 06:41.250 The next one is that is the hardware interrupt. 06:41.480 --> 06:48.560 So this part explains or shows us are the normal here shows us that the amount of time spent by the 06:48.560 --> 06:54.990 sleep you are interacting with the hardware and the next parties aside there is software interrupt. 06:55.280 --> 07:03.710 So at this point or this part explains us the amount of time spent by the people interacting with the 07:03.710 --> 07:12.140 software and the last one is and see the value at this point indicate the amount of time stolen by the 07:12.140 --> 07:16.000 watch you live in hypervisor from it were tool machine. 07:16.130 --> 07:23.090 So in this way this third party explained on the information about the C.P. and the system the next 07:23.240 --> 07:26.690 row explain the information about the memory. 07:26.900 --> 07:34.070 So it explains the total amount of memory available then all of that the free and out of that the user 07:34.400 --> 07:42.830 and the rest is the buffer or cache memory and the next to explain the information about this memory 07:43.190 --> 07:50.390 like total memory and then free and then the user and then available memory for use. 07:50.720 --> 07:53.200 OK let's talk about the last through here. 07:53.390 --> 07:59.150 The first part here reveals the ID that is the process id the process IDs are very important. 07:59.150 --> 08:02.770 Suppose you want to process then process. 08:02.800 --> 08:06.690 You need pro-white the process id come on. 08:06.890 --> 08:08.540 So the next part is the user. 08:08.600 --> 08:12.900 So it reveals that user information to which the process belongs. 08:13.050 --> 08:20.050 OK the next one is Pierre explains those top priority or shows us the priority of the process. 08:20.090 --> 08:21.690 The next one is Yanai. 08:21.740 --> 08:27.140 That is the nice value with the help of nice value we can set priorities. 08:27.410 --> 08:35.500 So we're going to learn about this in the next lesson or the next part the next is the Arti it shows 08:35.500 --> 08:39.870 us the total amount of memory limited by the process. 08:39.950 --> 08:40.440 OK. 08:40.550 --> 08:49.430 So the pressure on processors currently occupied thousand one hundred fifty two bytes of memory and 08:49.820 --> 08:50.690 the next part. 08:50.700 --> 08:58.400 So those are yes that is the resident memory resident memory the memory of which is actually user out 08:58.400 --> 09:00.090 of the hour. 09:00.280 --> 09:01.300 Ms. 09:01.370 --> 09:08.560 Plimmer memory and the next one is shared memory means the memory which is shared by this process other 09:08.700 --> 09:09.610 process. 09:09.750 --> 09:12.080 They are of the use of that memory. 09:12.200 --> 09:14.670 And the next part is as. 09:14.810 --> 09:17.930 Which explains all shows and the status of the process. 09:18.110 --> 09:22.020 R-Minn. said that is running as a means in the sleeping mode. 09:22.400 --> 09:28.830 If it shows zero that means it is a zombie process if its showing you the that mean it is clear signal 09:28.880 --> 09:35.590 or stop a process and if it shows your ID that means it needs an interrupt cable. 09:35.600 --> 09:36.690 Sleep OK. 09:36.730 --> 09:46.750 In this way the symbols reveals the status next door is CPQ the Sibiu part here shows us the amount 09:46.750 --> 09:50.890 of C.P. activities causer in the last quailing cycle. 09:51.430 --> 10:00.120 So what is all the cycle online cycle means the time in which a device or process monitored once ok 10:00.390 --> 10:02.210 and continuously. 10:02.210 --> 10:09.570 So in this way is use the information about the last polling cycle and then the next part is memory. 10:09.760 --> 10:14.970 So this is the percentage of memory that has used in the last billing cycle. 10:15.040 --> 10:21.670 The next one is the time this indicates the total amount of time that has used by the process since 10:21.670 --> 10:23.500 first it was started. 10:23.790 --> 10:25.660 Okay the next part is come on. 10:25.660 --> 10:26.260 Okay. 10:26.260 --> 10:29.950 So the process which is belong to which come on. 10:30.010 --> 10:32.130 So it gives information about it. 10:32.290 --> 10:40.650 So in this way you can monitor here all the information which is very essential as System Administrator. 10:40.990 --> 10:47.300 Suppose you want to kill a process then just press key on your keyboard. 10:47.470 --> 10:56.420 And here you can see it shows full persons IDs booty 1 7 so and will be 3 1 7. 10:56.630 --> 10:59.390 And he sent P.O.D.. 10:59.480 --> 11:07.590 He wanted to signal the OK here you can see the come on top is stop here. 11:07.670 --> 11:11.970 When we send this number signal to this. 11:12.170 --> 11:12.760 OK. 11:12.980 --> 11:17.650 So there are different kinds of signals so that we're going to learn in the upcoming lesson. 11:17.930 --> 11:22.760 So there are some other things that you can't do that this stuff come on like this. 11:22.910 --> 11:29.760 You want to delay the output of these processes then you can delay it by pointing in seconds. 11:30.240 --> 11:31.910 Let's see the output. 11:32.070 --> 11:32.650 OK. 11:32.720 --> 11:38.420 You can see it showing the output with the delay of two seconds. 11:38.690 --> 11:40.440 Let's send it to zero. 11:40.790 --> 11:41.350 OK. 11:41.530 --> 11:45.050 And now here you can see how fast showing that look. 11:45.280 --> 11:46.040 OK. 11:46.250 --> 11:56.390 OK the next suit use Front be with this switch you can view a particular process that was three to go. 11:56.750 --> 11:59.740 But currently it's not showing anything here. 12:00.230 --> 12:07.520 But remember that with this you can view information about that particular process by sending here that 12:07.880 --> 12:18.160 process ID when you pass for B then it start or it shows the output in non indirect do more. 12:18.410 --> 12:22.370 OK let's see what is non-interactive more OK. 12:22.400 --> 12:25.740 Like this means we can't do anything here. 12:25.990 --> 12:37.580 It's continuously shows in this way the output to stop Press Control see it let's clear it up for you. 12:37.690 --> 12:42.910 You can view an information about a particular user like this. 12:43.180 --> 12:43.840 OK. 12:43.840 --> 12:50.380 So it's currently showing in the process initiated by the user Prashanth like this. 12:50.410 --> 12:52.370 Plus Control-C to stop. 12:52.680 --> 12:55.610 OK let's start again the top. 12:55.680 --> 13:03.180 Suppose you press there then you can see the output format of any press B. 13:03.250 --> 13:06.960 Then you can highlight it ok like this. 13:07.170 --> 13:14.060 In this way you can do a lot of more important information with the help of these commands. 13:14.170 --> 13:19.440 Next important come on the show is uptight. 13:19.660 --> 13:22.880 Use you the same information that we solve it. 13:22.880 --> 13:30.820 C'mon c'mon free it should you the same ought to be solved with the help of God. 13:30.820 --> 13:33.770 Come on about the computer memory. 13:34.050 --> 13:34.450 OK. 13:34.460 --> 13:41.500 In this way you can see the list of processes that are running on your system and you can see the amount 13:41.500 --> 13:45.030 of memory that is used by any particular process. 13:45.120 --> 13:53.110 Again with the help of that you can get to the point that which process is actually causing the problem. 13:53.110 --> 13:56.930 Like hanging your system or not turning in proper way. 13:57.300 --> 14:03.640 OK in the next lesson I'm going to show you how to set the priorities of the processes. 14:03.640 --> 14:06.940 Again with the help of nice and really nice. 14:06.940 --> 14:07.480 Come on.