WEBVTT 00:01.260 --> 00:06.630 Running processes in the background in Linux, whether you are working from the command line or the 00:06.630 --> 00:09.570 graphical user interface you're working with in a show. 00:10.020 --> 00:13.260 So all comments are thrown or executed from within the shell. 00:13.740 --> 00:18.330 So I mean, if they run from the graphical interface, then execute the command. 00:18.720 --> 00:24.210 The show waits until the command is completed before opening it under command prompt at times. 00:24.240 --> 00:29.730 Uh, you may want the process to run in the background rather than having to wait for it to complete 00:29.730 --> 00:30.360 in the terminal. 00:30.960 --> 00:37.830 For instance, say we want to work on a script in a text editor and so have called our text editor. 00:38.190 --> 00:42.030 In this case, our mouse pad by entering here mouse pad. 00:43.120 --> 00:51.130 Mousepad, for example, in the script here, as you can see here, we open it, but we cannot import 00:51.130 --> 00:54.080 any comments here. 00:54.640 --> 01:01.090 So in this case, the Basho will open the emails per text editor to create a new script here, as you 01:01.090 --> 01:01.810 can see here. 01:03.010 --> 01:09.640 Uh, so while we work in the text editor, the terminal is occupied with running the text editor. 01:09.940 --> 01:17.500 So if a return to the terminal and we shall see that is running our text editor and we have no new prompt, 01:17.500 --> 01:25.000 for example, unless like then we have no new prompt to allow us to enter more commands. 01:25.420 --> 01:28.570 So we called, of course, opening another terminal like that. 01:29.350 --> 01:30.370 Uh, and. 01:32.380 --> 01:34.320 Use this common sewer like that. 01:36.930 --> 01:37.500 And. 01:39.210 --> 01:45.540 But a better option to save resources and the screen real estate is to start a text editor running in 01:45.540 --> 01:46.230 the background. 01:47.230 --> 01:53.310 Uh, so running a person in the background simply means that it will continue to run without needing 01:53.310 --> 02:00.750 to needing the terminal in the swinging, the terminal is freed up for other other jobs and duties. 02:01.320 --> 02:03.540 So to start then takes editor in the background. 02:03.540 --> 02:06.000 Just opened an ampersand. 02:06.300 --> 02:07.800 Here, I will show you. 02:08.520 --> 02:15.390 So, uh, we deleted, um, closed our, uh, mouse pad here. 02:15.390 --> 02:17.700 So now, uh, for if we want to. 02:19.910 --> 02:24.920 Started texting during the background, just opened an ampersand to the end of the comment like that, 02:24.920 --> 02:28.120 for example, mousepad um. 02:29.680 --> 02:39.040 Example, uh, a text here and ad ampersand, um, here and enter. 02:39.490 --> 02:47.140 So as you can see here, we can see our society is three thousand two hundred eighteen and now we can 02:47.170 --> 02:48.670 use commands here. 02:48.880 --> 02:49.210 So. 02:49.840 --> 02:55.270 So now the text editor opens here like that's determined a lot of times a new comment prompt so we can 02:55.270 --> 03:01.660 enter other comments on our system while also editing our new script here. 03:01.940 --> 03:03.550 Uh, example text. 03:04.090 --> 03:09.850 So this is effective for any process that may run for a significant length of time. 03:10.240 --> 03:16.780 When you want to use HTML as a hacker, you will find this useful for running multiple terminals within 03:17.410 --> 03:20.920 multiple tasks to save resources and the screen space. 03:22.700 --> 03:29.090 Moving process to the foreground, if you want to move the process running in the background to the 03:29.090 --> 03:38.560 foreground, you can use the F G F G command so that if you command requires the process idea here. 03:39.440 --> 03:45.680 Uh, press side here and of the presses you want to return the foreground as shown here. 03:45.680 --> 03:51.190 For example, the twenty thousand two hundred eighteen here jab not found. 03:51.200 --> 04:04.040 So we will now find that these, uh, my examples and here, for example, uh, PSP is out here and 04:04.040 --> 04:06.500 grab examples here. 04:07.010 --> 04:11.660 Uh, this is the example of texts or three, uh, three thousand two hundred eighteen. 04:17.640 --> 04:19.170 Here so. 04:20.630 --> 04:23.040 If you don't know, they're here. 04:23.110 --> 04:26.160 Uh, this is the piece here. 04:26.180 --> 04:26.810 Three hundred. 04:35.570 --> 04:36.980 So you can see here. 04:43.750 --> 04:45.370 Like that, so. 04:46.620 --> 04:50.340 Now I want to show you the scheduling processes. 04:52.380 --> 04:55.020 So as a hacker, you're. 04:57.010 --> 05:04.330 Uh, what Linux system administrators and hackers often need to schedule this tool will run at a particular 05:04.330 --> 05:05.110 time of day. 05:05.890 --> 05:13.660 So a system administrator might want to schedule system backup to run every Saturday night at two a.m., 05:14.290 --> 05:21.160 for example, a hacker might want to set a script to run the perform reconnaissance on a regular basis, 05:21.490 --> 05:23.860 finding open ports or vulnerabilities. 05:24.130 --> 05:34.660 So in Linux, you can accomplish this in at least two ways with add and uh, and current currently. 05:36.090 --> 05:43.310 We have two comments to do that, so the Ad Month is a damning e-book from Perseus, useful for scheduling 05:43.610 --> 05:47.100 a job to run once at some point in the future. 05:48.120 --> 05:54.660 The current deal is more suited for scheduling tasks to occur every day, every week, every month, 05:54.660 --> 05:58.200 and we will cover this in detail in later lectures. 05:58.800 --> 06:08.190 So we use the ATM at Diamond to schedule the execution of a program, our command or set of commands 06:08.190 --> 06:08.790 in the future. 06:09.120 --> 06:14.820 So the syntax is simply the at command, followed by the time to execute the process. 06:15.720 --> 06:20.370 The time argument can be provided by in various formats here, for example. 06:22.580 --> 06:29.320 What we can do like that, and it's open this, so this will be useful, and I will show how this looks. 06:33.700 --> 06:45.910 So, for example, at seven, 12 p.m., for example, at seven, 20 p.m., June 25. 06:47.120 --> 06:50.960 And actually, uh, and it's I was twenty five. 06:52.820 --> 06:55.370 Know, for example, at noon. 06:56.500 --> 06:57.670 At noon. 06:58.630 --> 07:02.560 One, for example, or August 23. 07:03.750 --> 07:06.030 And two more road. 07:07.780 --> 07:08.850 At No. 07:09.070 --> 07:11.620 Plus 20 minutes. 07:13.490 --> 07:29.390 That's now put hours, 10 hours at now, plus five days at now, plus three weeks and at 7:20 pm. 07:29.990 --> 07:43.790 Uh, for example, uh, six or for example, September here, uh, September, uh, nineteen uh, in 07:43.940 --> 07:47.600 two thousand twenty, uh, twelve. 07:47.830 --> 07:49.970 Yeah, twenty twenty two here. 07:50.510 --> 07:57.230 So this is scheduled, uh, to run at seven twenty p.m. on the current day. 07:57.560 --> 08:04.300 This scheduled to run at seven, uh, twenty p.m. on August 25. 08:04.640 --> 08:07.010 This is scheduled to end around noon. 08:07.010 --> 08:17.360 This scheduled to run Aug. 23 and, uh, tomorrow and we can specify and, uh, uh, time as well. 08:17.750 --> 08:24.950 So, uh, when you enter the them on, uh, with the specified time at goes into interactive mode and 08:24.950 --> 08:27.500 you are greeted with an at prompt. 08:27.500 --> 08:33.290 So let's try it, for example, at seven. 08:34.630 --> 08:36.850 Uh, four to six. 08:39.560 --> 08:40.280 Let's hear. 08:41.540 --> 08:42.610 Yes, install it. 08:44.340 --> 08:46.500 Currently, my passport, yes. 08:50.730 --> 08:58.560 It may take some minutes, uh, so it's actually 50 megabytes here, so it will download now. 09:19.100 --> 09:29.120 Here at, uh, so at, uh, seven, four to seven, as you can see here now is four six. 09:29.630 --> 09:38.480 And now we will now use common sense, for example, road or, uh, for example, Ellis. 09:40.140 --> 09:40.590 So. 09:42.880 --> 09:45.040 Then it is a snippet. 09:46.050 --> 09:51.490 Uh, well executed here, for example, uh, see they here home. 09:53.420 --> 09:55.640 Like that, so. 09:57.560 --> 10:05.750 Managing processes in Linux is a is a key skill for every Linux user and hacker, so you must be able 10:05.750 --> 10:11.870 to leave, find, kill, prioritize and schedule processes to make sure Linux instance optimally. 10:12.500 --> 10:20.450 A hacker often will will need to find processes on the target so they want to kill, such as the antivirus 10:20.450 --> 10:28.100 software or a firewall, so they will also need to manage multiple processes in a reasoned attack and 10:28.100 --> 10:29.030 prioritize them.