WEBVTT 00:00.560 --> 00:00.880 Okay. 00:00.880 --> 00:07.680 In the previous package, we, uh, created our application for changing a mac address, and it is working 00:07.680 --> 00:08.520 perfect. 00:08.920 --> 00:11.760 So now let me collapse this. 00:11.800 --> 00:15.080 Okay, so here we have two function get argument. 00:15.080 --> 00:17.040 And also changing the Mac address. 00:17.640 --> 00:19.640 It is asking to argument. 00:19.680 --> 00:22.600 Okay for interface and new Mac address. 00:23.920 --> 00:25.760 And we are calling those two. 00:25.800 --> 00:27.160 Here we are using it. 00:27.560 --> 00:36.040 Now let me uh create our before creating okay I will do something here. 00:36.240 --> 00:40.160 So here we are going to design an algorithm okay. 00:40.200 --> 00:42.080 For changing the Mac address. 00:42.440 --> 00:46.800 So first thing we ask what is an algorithm okay. 00:46.840 --> 00:52.440 An algorithm is steps of writing a program okay. 00:53.120 --> 00:59.040 We write an application or a program in many steps to solve a problem. 00:59.040 --> 01:00.870 So that is called algorithm. 01:01.430 --> 01:07.870 Now we are going to design an algorithm here to change the Mac address. 01:08.030 --> 01:12.790 So what is the those steps that we want to do. 01:12.830 --> 01:13.910 Okay. 01:13.950 --> 01:21.910 So the first step is to execute and read ifconfig. 01:21.950 --> 01:22.350 Okay. 01:23.070 --> 01:29.110 Execute and read ifconfig. 01:29.270 --> 01:29.670 Okay. 01:30.790 --> 01:33.790 And what is the second part. 01:34.990 --> 01:41.670 Second step it is to read the Mac address from the output as you see here. 01:41.710 --> 01:42.110 Okay. 01:43.470 --> 01:45.670 While we are trying to change the Mac address. 01:45.870 --> 01:48.150 First we use ifconfig okay. 01:48.430 --> 01:52.430 So the first part is to write ifconfig. 01:52.430 --> 01:59.310 And then I like this like here to read the command from output okay. 02:00.620 --> 02:03.100 So this is going to be read Mac address. 02:03.140 --> 02:03.540 Okay. 02:04.580 --> 02:05.860 Read the Mac address. 02:07.780 --> 02:08.220 Okay. 02:08.620 --> 02:09.620 From output. 02:11.500 --> 02:19.260 And we have the next part which is the third part or the third section or the third step. 02:19.260 --> 02:25.140 In here we are going to check if Mac address in ifconfig is what the user requested. 02:25.180 --> 02:26.060 Okay. 02:26.100 --> 02:26.820 Very easy. 02:27.060 --> 02:28.700 So here we just check it. 02:28.740 --> 02:29.300 Okay. 02:29.340 --> 02:42.540 Check if Mac in ifconfig is what is what the user requested. 02:44.660 --> 02:46.420 So this is the third part. 02:46.460 --> 02:51.820 And also the final part is going to be the fourth one. 02:52.180 --> 02:55.220 And here we are going to print an appropriate message. 02:56.020 --> 02:56.900 So let's say. 02:59.810 --> 03:01.730 Appropriate message. 03:02.130 --> 03:03.050 Okay. 03:03.090 --> 03:09.290 So in this four step we are going to write an algorithm here. 03:09.330 --> 03:09.730 Okay. 03:10.330 --> 03:14.130 To do this to get the goal. 03:14.130 --> 03:19.810 The goal is to check if Mac address is changed or not. 03:19.850 --> 03:20.370 Okay. 03:20.370 --> 03:21.210 Very easy. 03:21.610 --> 03:23.530 So here I am going to. 03:25.970 --> 03:30.450 Uh I'm going to use a function called check output. 03:30.490 --> 03:31.410 Okay. 03:31.450 --> 03:35.930 And it is from this subprocess here I'm going to check that okay. 03:35.970 --> 03:43.050 I'm going to use that to check if uh we are executing the ifconfig or not. 03:43.210 --> 03:43.610 Okay. 03:43.810 --> 03:49.490 So let's do that here I'm going to use subprocess dot check. 03:50.290 --> 03:52.250 Output is a function okay. 03:52.290 --> 03:54.770 That belongs to the subprocess. 03:54.770 --> 03:58.550 And here inside this I'm going to give the give the command. 03:58.590 --> 03:58.790 Okay. 03:58.830 --> 04:00.270 So I'm going to use a list. 04:00.510 --> 04:02.150 So it is going to be ifconfig. 04:02.470 --> 04:05.630 Ifconfig ifconfig okay. 04:05.950 --> 04:07.470 And what is the second one. 04:07.670 --> 04:09.710 And you know it is the name of the interface. 04:09.750 --> 04:10.150 Okay. 04:10.350 --> 04:13.870 For example we have LAN zero, we have eta zero. 04:14.190 --> 04:15.270 And a lot of things. 04:15.310 --> 04:15.710 Okay. 04:15.910 --> 04:21.630 But here we are going to use options dot interface. 04:23.830 --> 04:24.230 Okay. 04:24.430 --> 04:25.230 That is here. 04:26.710 --> 04:29.830 And finally we are going to print this okay. 04:30.030 --> 04:31.990 So let's use print. 04:33.830 --> 04:34.710 Print what. 04:34.750 --> 04:35.070 Okay. 04:35.070 --> 04:39.790 Let's first store this into a variable I'm going to name it ifconfig result. 04:39.830 --> 04:40.230 Okay. 04:40.830 --> 04:43.830 Ifconfig underscore result. 04:43.870 --> 04:45.990 It is assigned to this. 04:45.990 --> 04:48.990 And here I'm going to print that. 04:51.030 --> 04:53.550 And also I'm not going to change the Mac address. 04:53.590 --> 04:54.030 Okay. 04:54.030 --> 04:57.740 So let's comment that and save it. 04:58.100 --> 04:59.140 Let's come back here. 04:59.500 --> 05:01.380 I'm going to clear it. 05:01.500 --> 05:01.900 Okay. 05:02.620 --> 05:08.660 And here, right now, I am trying to change the Mac address for eth0. 05:08.700 --> 05:11.700 Okay, now, let's, uh, while I'm hitting enter. 05:11.700 --> 05:14.780 So it must print the result of ifconfig for me. 05:16.180 --> 05:16.740 Okay. 05:16.860 --> 05:21.300 As you see, it is printing the ifconfig for me, and that is eth zero. 05:21.340 --> 05:21.820 That is. 05:21.980 --> 05:22.260 Here. 05:22.260 --> 05:23.140 You see it okay. 05:24.860 --> 05:27.620 And let's see what else do we have. 05:28.220 --> 05:29.460 Where is the Mac address. 05:29.500 --> 05:30.660 That is either here. 05:30.700 --> 05:31.540 Okay. 05:31.580 --> 05:32.340 This is it. 05:32.900 --> 05:41.580 So right now you see we are changing the we're trying to get the output, uh, trying to execute the 05:41.620 --> 05:42.140 writ. 05:42.700 --> 05:43.540 Uh, ifconfig. 05:43.580 --> 05:43.740 Okay. 05:43.740 --> 05:45.060 Execute and read f config. 05:45.260 --> 05:48.740 So this is the first part that we have done it okay. 05:48.780 --> 05:54.180 The second or the next part or the next step is to read Mac address from output. 05:54.580 --> 05:57.060 So let's go and do that in the next video.