WEBVTT 00:00.110 --> 00:05.450 Ros2 is now installed, but before you can use it, you need to set up your environment. 00:05.480 --> 00:11.330 To do that, we will just have to source one bash script that is placed in the installation directory 00:11.330 --> 00:12.230 of Ros2. 00:12.260 --> 00:14.270 And just to show you what I'm talking about. 00:14.270 --> 00:16.250 So there is a Rose two command line tool. 00:16.250 --> 00:18.200 We're going to come back to this in this course. 00:18.200 --> 00:24.440 But if you just run Ros two like this you will see Ros two command not found. 00:24.470 --> 00:24.860 Okay. 00:24.890 --> 00:29.210 So that means that Ros two is installed but not set up in the environment. 00:29.240 --> 00:33.170 Now I'm going to go to slash Opt. 00:33.410 --> 00:36.740 And Ros is actually installed inside slash opt. 00:36.740 --> 00:39.500 So you should find Ros like this. 00:39.680 --> 00:46.250 And then you will have one directory that corresponds to the Ros two distribution you have just installed. 00:46.250 --> 00:49.130 So in our case it's jazzy. 00:49.160 --> 00:55.670 Inside this jazzy folder you see we have a setup dot bash script. 00:55.670 --> 01:01.490 So if I want to run Ros two in this terminal I need to source that script. 01:01.490 --> 01:11.060 So I need to do source slash opt slash Ross slash jazzy slash setup dot bash. 01:11.270 --> 01:14.090 Now Ross two is sources in that environment. 01:14.090 --> 01:21.080 And if I do Ross two again, you see we have a usage message because we cannot just run Ross two like 01:21.080 --> 01:21.530 this. 01:21.530 --> 01:24.620 But you see that the Ross two command has been found. 01:24.650 --> 01:26.090 Okay, we have a different message. 01:26.090 --> 01:30.380 So basically you will need to source that in every terminal. 01:30.380 --> 01:33.920 You can see if I do Ross two here command not found. 01:33.920 --> 01:41.630 If I source the setup dot bash script which is here, then it's working. 01:41.630 --> 01:46.790 And that's going to be quite annoying if we have to source that script every time we open a terminal. 01:46.790 --> 01:51.890 So for that we are going to add this line inside the bash RC. 01:51.890 --> 01:54.650 So let's go back to our clear. 01:54.680 --> 02:04.090 Let's go back to our home directory and let's open with git dot bash RC which is in your home directory. 02:04.120 --> 02:04.810 Okay. 02:05.620 --> 02:07.960 So it's going to open a file like this. 02:07.960 --> 02:09.070 You should have that. 02:09.070 --> 02:10.480 And what is the bash SC. 02:10.510 --> 02:15.820 Well very basically that's a bash script that's going to be run every time you open a new session. 02:15.820 --> 02:20.890 So basically if you open a new terminal all those commands here are going to be run. 02:21.010 --> 02:27.520 So you go at the end of the file here at the very end, and you are going to add a new line, which 02:27.520 --> 02:29.410 is basically that one. 02:29.410 --> 02:35.350 So you just copy that one with Ctrl shift and C and then Ctrl V here. 02:36.430 --> 02:36.610 Okay. 02:36.610 --> 02:43.690 So at the end of your bash RC should be like this source setup bash script from the installation folder 02:43.720 --> 02:45.970 of your roster distribution. 02:45.970 --> 02:49.630 Now I'm going to save okay. 02:49.660 --> 02:50.980 Close the file. 02:50.980 --> 02:53.500 And then we'll just close all the terminals. 02:53.500 --> 02:54.880 Let's open a new one. 02:55.300 --> 03:01.960 And now if I do Ros2 you see that what Ros2 has already been sourced in that environment.