WEBVTT 00:00.740 --> 00:05.180 Sometimes we will want to stop a process without terminating it. 00:05.300 --> 00:10.910 This is often done to lower the foreground process to move to the background. 00:11.000 --> 00:15.080 So stop a foreground process and place it in the background. 00:15.110 --> 00:17.030 Press control Z. 00:17.450 --> 00:19.040 Actually, let me write that down here. 00:19.040 --> 00:19.970 Control. 00:21.800 --> 00:22.190 Here. 00:25.640 --> 00:27.350 Control. 00:32.750 --> 00:33.920 Plus Z. 00:35.540 --> 00:43.610 Here, so you will want to press Ctrl Z to stop a foreground process and place it in the background. 00:43.610 --> 00:44.420 So let's try it. 00:44.420 --> 00:49.100 And at the command prompt here we will type the X logo. 00:49.190 --> 00:54.860 And here, as you can see, our X logo is opened right here now. 00:55.370 --> 00:59.360 And actually let's make it on the top so we will see what happens. 00:59.630 --> 01:02.000 Right now, always on top. 01:02.000 --> 01:04.160 Let's make it bigger here. 01:04.880 --> 01:08.150 So now let's press the Ctrl Z. 01:09.540 --> 01:18.370 And as you can see here, the we can interact with the bash, but also the logo X logo program is not 01:18.390 --> 01:19.170 terminated. 01:19.290 --> 01:26.880 So after stopping X logo, we can verify that the program has stopped by attempting to resize. 01:27.420 --> 01:28.800 As you can you see here. 01:28.980 --> 01:29.700 Yeah. 01:30.270 --> 01:33.840 It's not behaving as like the previous example, right. 01:33.930 --> 01:36.420 So the program. 01:37.360 --> 01:41.860 Stopped, um, by at when we attempt to resize the logo window. 01:41.860 --> 01:44.530 So we will see that it appears quite dead. 01:44.560 --> 01:51.100 So we can either continue the program execution in the foreground using the FG command. 01:53.060 --> 01:58.850 Or resume the program's execution in the background with the BG command here actually now we will pray 01:58.880 --> 02:01.010 and we will pray another control here. 02:01.010 --> 02:03.890 It's almost suspended here, as you can see here. 02:03.890 --> 02:07.700 It will not print our appropriate X logo right here. 02:07.700 --> 02:11.060 And let's now use the BG here. 02:11.060 --> 02:13.880 And as you can see here, it is also. 02:15.980 --> 02:25.070 Provide from our background here, but now we can also interact when we write here by BG instead of 02:25.310 --> 02:28.280 FG, we can also interact with the Terminal Bash script. 02:28.280 --> 02:29.450 So that's it. 02:29.600 --> 02:36.470 So with the FG command, the job spec is optional if there is only one job. 02:36.470 --> 02:37.460 So moving. 02:37.580 --> 02:46.440 So since we don't have any background job at that time, we didn't need to mention it, but if you do 02:46.460 --> 02:49.370 would want to mention it, you will write background. 02:49.370 --> 02:52.490 Firstly, you will write jobs as we did in previous and here. 02:52.490 --> 02:52.730 Now. 02:52.730 --> 03:01.280 After that you will write BG and your job and as you can see here, job already in background. 03:02.080 --> 03:02.590 So. 03:03.760 --> 03:08.650 Moving a process from the foreground to background is handy if we launch a graphical program from the 03:08.650 --> 03:16.540 command line, but forget to place it in the background by appending the trailing and operator. 03:16.540 --> 03:20.890 So why would we want to launch a graphical program from the command line? 03:20.890 --> 03:22.900 So there are two reasons for that. 03:23.140 --> 03:30.430 The program you want to run might not be listed on the window manager menus such as X logon. 03:31.370 --> 03:32.000 Here. 03:33.410 --> 03:34.670 We don't have x logo, right? 03:35.090 --> 03:35.840 X logo. 03:36.720 --> 03:41.310 We just only have run X logo here, which is this is just a comment that runs like X logo. 03:42.210 --> 03:44.130 But we don't have any additional nexus. 03:44.170 --> 03:45.030 Actually, let me. 03:46.260 --> 03:48.750 Close this previous X logo here. 03:50.030 --> 03:50.450 Here. 03:51.360 --> 03:54.180 We don't have X logo in our program. 03:54.180 --> 04:00.780 So biological program from the command line, you might be able to see error messages that would otherwise 04:00.810 --> 04:04.040 be invisible if the program were launched graphically. 04:04.050 --> 04:09.600 So sometimes a program will fail to start up when launched from a graphical menu by launching it from 04:09.600 --> 04:10.440 the command line. 04:10.440 --> 04:14.050 Instead, you may see an error message that will reveal the problem. 04:14.070 --> 04:18.930 Also, some graphical programs have interesting and useful command line options.