WEBVTT 00:00.930 --> 00:08.850 Changing gears shall prompt your share from the environment variable here provides you with useful information, 00:08.850 --> 00:14.850 such as the user you are operating as and the director in which you're currently working. 00:15.120 --> 00:18.930 So the default should prompt in color text the following year. 00:19.380 --> 00:27.480 Users here can use their name, first name and current, uh, current directory. 00:29.310 --> 00:36.450 So if you're working with the real route user, this translates to this, for example, root at Cowley 00:36.450 --> 00:39.300 and Core and Directory. 00:43.540 --> 00:49.750 So you can change the name in the default shopfront by setting the value from the Florida is one variable 00:49.750 --> 00:55.600 that so the is one variable has set of placeholders for information you want to display in the prompt, 00:56.260 --> 01:03.010 including the name of the current user, the host name and the base name of the current working directory. 01:04.030 --> 01:11.050 So this is very useful if you happen to have shows on multiple systems are a little bit on an as multiple 01:11.050 --> 01:11.530 accounts. 01:11.550 --> 01:18.970 So by setting different users and host names and values for different channels or accounts, you can 01:18.970 --> 01:23.410 tell at a glance who you are and what your current system is. 01:23.890 --> 01:27.460 So let's have a little fun on showing the prompt in your terminal. 01:27.460 --> 01:30.780 For example, you could enter here. 01:30.860 --> 01:31.960 Pierce one. 01:33.170 --> 01:43.250 Here, uh, for example, uh, World's best anchor here and his shtick here. 01:45.180 --> 01:49.950 As you can see here now, our common theme is like that here. 01:50.580 --> 01:56.040 So now every time you use this terminal, you will be reminded that you are the world's best hacker. 01:56.400 --> 02:02.670 But any subsequent terminal you open will still have the default command ground because the P is one 02:02.670 --> 02:06.030 variable only those values for your terminal session. 02:06.360 --> 02:10.860 Remember, until you export a variable, it is only good for that session. 02:11.280 --> 02:17.740 So if you really like this new command prompt and want to see it in every terminal, you need to take 02:18.000 --> 02:19.020 a unit to export it. 02:19.020 --> 02:21.840 So like that, export P.S. one. 02:21.840 --> 02:30.690 But I will not do it in this year, so this will make the chains so chain dependent across all sessions. 02:31.570 --> 02:33.360 How about a little more fun? 02:33.390 --> 02:38.670 Here's the thing you really want your terminal to look like the Windows CE in the prompt. 02:39.420 --> 02:43.730 So that's actually it's quite boring actually here. 02:44.790 --> 02:51.000 So say you really want your terminal to look like a windows in the prop. 02:51.390 --> 02:56.760 So in this case, you can't change the prompt name you see and keep it down below. 02:56.760 --> 03:03.060 Have to control your current directory as here, for example, export. 03:04.130 --> 03:11.210 Export p es from excellent experience one. 03:11.780 --> 03:23.600 And here in this film, we see him here, so we see and hear, you know, override Tableau for directory 03:23.600 --> 03:25.430 extrication, as you can see here. 03:39.010 --> 03:39.370 Here. 03:43.320 --> 03:43.710 Like there. 03:47.620 --> 03:50.290 We can do it for some severe bone loss. 03:51.450 --> 03:56.220 Like that, so having a prompt from your current director, it can be generally useful. 03:56.490 --> 03:57.840 So particularly for beginners. 03:58.170 --> 04:05.320 And so it's something to consider when you change your form variable, we can change pet as well. 04:05.350 --> 04:10.410 So one of the most important variables in your environment is pets. 04:10.440 --> 04:12.750 Variable, actually, it's boring, actually. 04:13.170 --> 04:19.860 So let's call it so one of the most important variables in your environment is your pet variable. 04:20.160 --> 04:26.160 So which controls were very on your system your shell will look for come once you enters, such as a 04:26.160 --> 04:28.440 see the list or equal here. 04:29.160 --> 04:41.040 So most commands are located in Espin or bin directory here, like a user locale, spin or user. 04:41.460 --> 04:45.630 Uh, use local being yeah. 04:46.050 --> 04:52.380 If the file doesn't find the command in one of the directors in your pet variable, it will return the 04:52.380 --> 04:54.630 command not formed like that, for example. 04:56.700 --> 04:58.200 Common would and liked it. 04:59.750 --> 05:08.000 So even if that comment does exist in the dire straits and, uh, not in your pet, so you can find 05:08.000 --> 05:16.310 out which directors are stored in your pet variable by using Echo and all our sign and pet. 05:17.180 --> 05:17.480 That's true. 05:17.550 --> 05:19.280 How serious are Patea? 05:19.850 --> 05:24.440 These are the directories where your terminal was searched for any command. 05:24.950 --> 05:33.290 When you enter L.A., for example, the system knows to look in each um, each of these directories 05:33.290 --> 05:33.940 for the L. 05:33.950 --> 05:41.270 S Command and when it finds out as, uh, the system executes it like that was. 05:43.030 --> 05:50.020 So each territory is separated by column, and you don't forget to add the dollar symbol in content 05:50.020 --> 05:51.700 pattern, as you can see here. 05:52.210 --> 05:56.200 So we can add them to the patch variable here. 05:56.410 --> 06:02.840 So you can probably see why it is important to know what is in your patch variable if you downloaded 06:02.890 --> 06:09.310 and install the new tool, let's say, for example, new hacking tool here, uh, into the root new 06:09.310 --> 06:10.510 hacking tool directory. 06:10.510 --> 06:16.960 You could only use commands from that tool and you are in that directory because the directory is not 06:16.960 --> 06:18.100 in the path variable. 06:18.520 --> 06:24.640 Every time you want it to use that, all you called you will first have to navigate routinely new hacking 06:24.830 --> 06:28.840 of which is a bit inconvenient if you want to use tool often. 06:29.410 --> 06:37.240 So to be able to use this new tool for any directory, you need to add the directory, uh, to holding 06:37.240 --> 06:42.370 this tool to your path variable to add new and you hacking tool to your pet's variable. 06:42.370 --> 06:51.160 Enter this command paths here equals here to our path and to that column here. 06:51.550 --> 06:54.880 And, for example, route new hacking tool. 06:54.880 --> 06:57.340 Here we added path variable here. 06:57.790 --> 07:06.100 So this assigns the original patch variable plus this the folder here directory to path to the new path 07:06.100 --> 07:06.520 variable. 07:06.790 --> 07:11.350 So the variable contains everything it did before, plus new tool directory. 07:12.190 --> 07:18.400 If you examine the contents of the patch variable, uh, again you should see that this directory has 07:18.400 --> 07:23.280 been appended to the end of the path, as shown here and Equal Partner X. 07:25.680 --> 07:28.050 Echo what, Pat? 07:29.370 --> 07:34.170 So you can see where that is, uh, a rule, it's new hacking tool here. 07:34.800 --> 07:40.590 So now you can accept new hacking tool applications from anywhere on your system rather than having 07:40.590 --> 07:43.540 navigate to is selected in the Bachelor. 07:43.570 --> 07:46.980 Look in our directories list for your new tool. 07:48.350 --> 07:51.530 So how not to add that valuable? 07:51.740 --> 07:59.030 So one mistake commonly made by new Linux users is assigning a new directory, such as the root new 07:59.270 --> 08:03.620 hiking tool to the patch variable like that had. 08:04.710 --> 08:08.190 Uh, here, uh, route new directory. 08:11.870 --> 08:13.100 New hacking. 08:14.100 --> 08:21.720 Look at this view, if you use this command, you'll pack variable will only contain the new hacking 08:21.750 --> 08:22.140 tool. 08:22.500 --> 08:28.740 So your pet variable will not contain this and you will delete all of these pet variables and only add 08:28.740 --> 08:29.110 this. 08:30.060 --> 08:32.070 This is useless. 08:32.190 --> 08:33.180 Uh, fortunately. 08:33.750 --> 08:35.580 So um. 08:37.720 --> 08:43.330 And no longer contain the system binaries directories such as being on the scene, so after doing this 08:43.330 --> 08:46.980 command, you cannot use LCD or any comments here. 08:47.760 --> 08:54.930 So when you then go to use any of these comments, you will receive the error command not found here. 08:55.880 --> 09:00.810 So remember that you want to append to the pet variable, not replace it. 09:00.820 --> 09:05.940 So if you are in doubt, send the contents of the variable somewhere before you modify it. 09:07.420 --> 09:07.870 So. 09:09.130 --> 09:15.250 We can create a user defined variable as well, so you can create your own custom user defined variables 09:15.250 --> 09:19.600 in Linux by simply assigning evaluate will be a new variable that you name. 09:20.230 --> 09:28.060 So this may be useful when you are doing the same as some more advanced scripting or find you are often 09:28.240 --> 09:32.500 using a long common that you get tired of typing over and over. 09:32.830 --> 09:38.260 So the syntax is straightforward enter the name of your variable, followed by assignment, assignment 09:38.270 --> 09:46.270 symbol and then the value to part in the variable as here, for example, my new variable and. 09:47.190 --> 10:01.440 Uh, here and for example, hacking is the most valuable, valuable skill set in the twenty first century. 10:04.810 --> 10:05.080 You. 10:06.730 --> 10:13.460 So this assigns a string to the variable mine environment, so to see the value in the VAT in that variable 10:13.460 --> 10:22.180 and use the Echo Command and the dollar content symbol to with the variable name, as we did earlier 10:22.180 --> 10:22.570 here. 10:22.900 --> 10:25.570 My new variable, which? 10:26.510 --> 10:32.720 As you can see, they're just like our system environment variables, user defined variables must be 10:32.720 --> 10:35.600 exported to persist to new sessions. 10:36.260 --> 10:45.680 So if you want to delete these new moneyball. or any variable use that on set on onset myname variable 10:46.760 --> 10:47.060 here. 10:47.330 --> 10:48.710 So now it's equal. 10:48.800 --> 10:51.440 And as you can see, we have no new variable pitch. 10:52.260 --> 10:52.670 So. 10:53.910 --> 11:00.240 You mean, because we deal with this variable with Ansett command and have to, uh, press and equal 11:00.330 --> 11:02.040 for printing to tomorrow? 11:02.160 --> 11:05.130 We can't see it because there is no credibility here. 11:05.160 --> 11:07.020 After all, setting this variable. 11:07.950 --> 11:13.830 So lastly, you might find in white, I'm afraid it was foreign, but it's worth getting to know them 11:13.980 --> 11:21.420 so they control how your working environment in Linux looks, acts and feels so you can manage these 11:21.420 --> 11:28.140 variables to tell in your environment, to your needs by changing them, exporting them and even creating 11:28.140 --> 11:30.720 your own, as we did in this case. 11:31.140 --> 11:35.760 So in some cases, these they may be useful for covering your tracks as a hacker.