WEBVTT 00:09.080 --> 00:14.570 Hello Friends will come back in this list and we're going to talk about the ones who will file permissions 00:14.630 --> 00:15.660 in Linux. 00:15.830 --> 00:20.000 In our previous lessons we learn how to sort of file permissions. 00:20.020 --> 00:21.410 It seems more combined. 00:21.470 --> 00:27.740 And in this lesson we're going to talk about the extra part of that come on again with more we can set 00:27.740 --> 00:35.150 up some extra permissions like setting up user ID group ID and also the sticky bit. 00:35.210 --> 00:35.510 OK. 00:35.510 --> 00:38.300 These are all permissions in Linux. 00:38.400 --> 00:38.780 OK. 00:38.930 --> 00:42.080 So let's see practically how to set them. 00:42.680 --> 00:43.300 OK. 00:43.320 --> 00:45.050 Most of all let's see. 00:45.130 --> 00:55.410 While there still are not 60 on this file I want to set the s you deeper mission that is search. 00:55.430 --> 00:56.460 User ID. 00:56.600 --> 01:03.440 So to send this permission you need to use the command see it's more like this. 01:03.440 --> 01:10.240 And if you want to set the permission for user then you and then close and then as. 01:10.310 --> 01:20.500 And then finally studen daughter XTi enter is asking for the password no less. 01:20.690 --> 01:29.000 And here you can notice that the extra S is headed at the end of the user permissions so that means 01:29.050 --> 01:33.160 we set this user ID on this file. 01:33.470 --> 01:35.130 So what is the use of it. 01:35.350 --> 01:42.470 OK when you said this permission on file then it could be dangerous because of when that this foreign 01:42.470 --> 01:47.200 file or any application OK it is very useful in case hope applications. 01:47.210 --> 01:52.380 Suppose there is an application which you need only to be used by Administrator. 01:52.430 --> 02:00.740 And if that administrator sacked this beat on hogi means it's said the user id then what happens is 02:00.860 --> 02:06.690 if all the users trying to access that application then that application runs. 02:06.740 --> 02:09.940 But it is declared as a group. 02:10.370 --> 02:16.980 It is treated as root means the normal user can perform all operations that user can. 02:17.090 --> 02:19.050 OK so it is very dangerous. 02:19.100 --> 02:27.790 So think twice before applying this permission on your application so you can set this on a file folder 02:27.800 --> 02:28.350 OK. 02:28.520 --> 02:36.590 So in this way you can set these permissions the next spool is as that is said group permission. 02:36.890 --> 02:41.620 So you can set that permission like this. 02:41.750 --> 02:47.450 Just simply replace this you will see again and hit enter. 02:47.500 --> 02:55.500 Now let's view you here again the on the yes is added to the group permissions. 02:55.540 --> 02:56.100 OK. 02:56.560 --> 03:00.150 So what is the use of that when you apply this permission to the group. 03:00.190 --> 03:03.400 It is work like sim as it work on user. 03:03.730 --> 03:07.940 But when you apply this permission on a directory. 03:07.960 --> 03:12.970 Then what happens is any file that you create inside the directory. 03:13.120 --> 03:16.670 And by default the ownership of the directories upload to that file. 03:16.720 --> 03:17.180 OK. 03:17.410 --> 03:19.300 So let's see how it works. 03:19.360 --> 03:22.360 Let's create a directory. 03:22.690 --> 03:23.770 We are OK. 03:23.800 --> 03:25.240 It is very useful. 03:25.360 --> 03:29.350 Permission in case of directories is ugly. 03:29.860 --> 03:34.060 And now let's say one 03:36.860 --> 03:40.830 to this. 03:40.850 --> 03:45.770 Now let's get this guys unless you know why. 03:45.800 --> 03:48.070 Touch screen. 03:48.200 --> 03:48.880 Not yet. 03:48.920 --> 03:50.670 He will. 03:51.210 --> 03:56.990 OK now here you can see a student or XTi face having user or owners present and group permission. 03:57.110 --> 03:59.680 So now is it. 03:59.730 --> 04:01.310 Oh no no. 04:01.310 --> 04:02.690 Tried to log in as you 04:06.340 --> 04:07.430 OK. 04:07.530 --> 04:09.710 Now let's get inside. 04:19.530 --> 04:22.660 OK now we are so stupid. 04:22.870 --> 04:26.210 We could have this not be x. 04:26.680 --> 04:28.530 The fight is clearly in here. 04:28.940 --> 04:36.710 No real Now here you can see the file start Estes greater by the rookie's. 04:36.740 --> 04:43.550 But here you can see the ownership of this directory at all readily transferred to this find. 04:43.610 --> 04:50.880 Now the owner of this file means the group owner of this file is present and in this way this permission 04:50.950 --> 04:57.560 is very helpful in some cases where you don't want to change the group owners. 04:57.580 --> 04:58.140 OK. 04:58.330 --> 05:02.420 In such cases you can apply this permission on a directory. 05:02.640 --> 05:03.250 OK. 05:03.460 --> 05:11.830 Or if there are some users who always want to change each other's files or always want to see each file 05:12.120 --> 05:13.840 and others won't them. 05:13.840 --> 05:17.770 So in that case you can apply this commission. 05:18.600 --> 05:18.940 Now 05:25.550 --> 05:32.840 now we are logging as president of the settings how to remove these beats or how good removes these 05:32.840 --> 05:39.740 permissions to remove these permissions you just need to be in place the plus sign minus sign that is 05:40.200 --> 05:43.630 more than you minus. 05:43.780 --> 05:47.840 That's true that they did like this 05:50.560 --> 05:51.630 Carlos. 05:51.990 --> 05:52.440 OK. 05:52.460 --> 06:00.700 Here you can see the permission for user is removed here from the student body XTi use. 06:00.920 --> 06:04.290 You can then remove the permission. 06:04.300 --> 06:11.900 With this come once the final permission and which is very useful permission that is sticky with one 06:11.900 --> 06:12.480 mission. 06:12.650 --> 06:15.590 So how to set it and what is it. 06:15.590 --> 06:19.340 So when you said the ticket with permission on a file. 06:19.610 --> 06:28.760 Then what happens is other users can read your file execute your file or editor but they can't rename 06:28.910 --> 06:33.950 or remove the fight or get the country name or we will find. 06:33.970 --> 06:43.920 So given the sort of the sticky bit permissions so set up sticky bit you use sudo more and then plasticity 06:44.080 --> 06:55.520 and the file the student got it and you know here you can see studen got its file there is and character 06:55.520 --> 07:01.610 is applied here that is the that means the sticky bit is on for this file. 07:01.710 --> 07:13.480 Remove that just put in place the plus minus It turned loose and you can see that it is removed. 07:13.850 --> 07:20.720 And this these are the Erewhon so they will permissions so that you can use in some particular conditions. 07:21.030 --> 07:28.560 But I don't find these permissions are so useful because the read write execute permissions are already 07:28.560 --> 07:30.870 there and they are both working. 07:30.870 --> 07:35.500 I personally find them the working of both the permissions same. 07:35.700 --> 07:37.630 So there is no greater difference in that. 07:37.650 --> 07:40.230 What Ubuntu provides and this feature. 07:40.230 --> 07:49.280 So that's why I thought it is important to know you are into everything that is present in the human 07:49.320 --> 07:50.240 do so well. 07:50.310 --> 07:53.840 So that is why I introduced this permissions here.