WEBVTT 00:00.710 --> 00:08.240 The default shell used in many Linux distributions is the neo-geo writes like this g. 00:08.270 --> 00:12.850 New here G and u. 00:12.890 --> 00:14.360 Bash shell. 00:14.750 --> 00:17.330 So this is the default shell of our Linux here. 00:17.450 --> 00:23.510 This section describes the basic features available in the bash shell, such as the Bash Manual, Tab 00:23.510 --> 00:27.080 Autocompletion and how to displays file contents. 00:27.080 --> 00:32.570 You will walk through how to work with Linux files and directories using the basic commands provided 00:32.570 --> 00:35.720 by the new Bash Shell. 00:36.170 --> 00:41.270 If you are already comfortable with the basics in the Linux environment, feel free to skip this section 00:41.270 --> 00:45.530 and continue with the next section to see more advanced commands. 00:45.560 --> 00:47.570 Let's start with the shell here. 00:48.110 --> 00:54.380 The new Bash Shell is a program that provides interactive access to the Linux system. 00:54.380 --> 01:00.090 It runs a regular program and is normally started whenever a user logs into terminal. 01:00.090 --> 01:09.300 So the shell that the system supports depends on your user ID configuration Here, actually let's delete 01:09.300 --> 01:09.510 it. 01:09.510 --> 01:13.800 So it depends on your user ID configuration. 01:14.750 --> 01:20.310 Uh, so the ATC passwd file here. 01:20.330 --> 01:21.110 Cat. 01:21.270 --> 01:21.590 Oops. 01:22.290 --> 01:27.500 Cat atc passwd here. 01:28.490 --> 01:34.130 Uh, this contains a list of all system users accounts, along with some basic configuration information 01:34.130 --> 01:35.330 about each user. 01:35.330 --> 01:42.140 So here's a sample entry from our Etsy passwd file. 01:42.140 --> 01:47.150 And as you can see, this is our user account that has the file name called Call. 01:47.990 --> 01:56.210 So each entry here has seven data fields with the fields separated by colons here. 01:56.210 --> 01:56.630 One. 01:56.630 --> 01:59.120 So this is one two. 01:59.760 --> 02:00.480 Three. 02:00.960 --> 02:01.980 Four. 02:02.220 --> 02:03.270 Five. 02:03.840 --> 02:05.940 Six and seven. 02:06.240 --> 02:10.500 So this each field separated by. 02:11.170 --> 02:13.000 Collins here, as you can see here. 02:13.810 --> 02:20.530 So the system uses the data in these fields against a specific features to the user for the user. 02:20.530 --> 02:24.610 So most of these entries are discussed in more detail in next sections. 02:24.610 --> 02:29.980 But for now, just pay attention to the last field which specifies here. 02:29.980 --> 02:33.640 Actually, let's make it like this so you can see it. 02:33.640 --> 02:35.020 More detail here. 02:40.080 --> 02:40.770 Here. 02:42.140 --> 02:47.360 So here, just pay attention to this last field here. 02:48.410 --> 02:52.150 Uh, so which specifies users shell program. 02:52.190 --> 02:57.920 So through this focus on the new bash shell, additional shells are weaved in this course. 02:57.920 --> 03:06.350 And in next lecture we will cover working with alternative shells such as dash and TXT here, so you 03:06.350 --> 03:07.670 will learn in next lecture. 03:07.670 --> 03:11.720 Also different types of shell applications and shells here. 03:12.620 --> 03:16.060 Uh, so in earlier here, this is the sample entry. 03:16.070 --> 03:24.680 The user typhoon here has been bash set as her default program here. 03:24.680 --> 03:26.960 The default, uh, program. 03:27.230 --> 03:28.580 So here. 03:29.520 --> 03:38.160 This means when typhoon logs into the Linux system, the bash system, this bash shell program is automatically 03:38.160 --> 03:38.670 started. 03:39.030 --> 03:45.660 So although the Bash Shell is program is started at login, whether a shell command line interface CLI 03:45.840 --> 03:50.280 command line interface is presented dependent on which login method is used. 03:50.280 --> 04:01.440 So if a virtual console terminal is used to log in the command line interface cli c l i prompt is automatically 04:01.440 --> 04:04.350 presented so and you can begin to type shell commands. 04:04.350 --> 04:10.140 However, if you log into the Linux system via graphical desktop environment, you need to start a graphical 04:10.140 --> 04:16.530 terminal emulator to access the Shell command line in command line. 04:18.100 --> 04:20.950 Interface, uh, prompt. 04:20.950 --> 04:24.370 And we also can use the, uh, shell prompt here. 04:24.370 --> 04:29.860 So after you start a terminal emulation package or log into the Linux virtual console, you can get 04:29.860 --> 04:33.820 access to the shell cli prompt. 04:34.570 --> 04:35.560 Uh, so. 04:36.720 --> 04:38.620 Uh, the prompt is your gateway to the shell. 04:38.640 --> 04:40.250 So this is the place where you. 04:40.650 --> 04:42.060 You enter shell commands. 04:42.060 --> 04:46.800 So the default prompt symbol for the bash shell is the dollar sign here. 04:46.800 --> 04:48.990 And this symbol is actually changed like this. 04:48.990 --> 04:51.570 And as you can see here, this is the dollar sign. 04:51.690 --> 05:01.590 So this symbol here, let's actually here this symbol indicates that the shell is waiting for you to 05:01.590 --> 05:02.070 enter. 05:02.070 --> 05:08.640 Text The different Linux distributions use different formats for the prompt in Ubuntu Linux system. 05:08.640 --> 05:11.850 The shell prompt should be look like this. 05:11.940 --> 05:13.710 And here. 05:15.730 --> 05:16.870 And in Santos. 05:16.870 --> 05:21.370 However, this is in the ubuntu here ubuntu. 05:24.090 --> 05:31.440 And in however in the sent us the default shell writing style will be like this. 05:32.490 --> 05:33.750 And dollar sign. 05:36.010 --> 05:38.500 This is in the sand. 05:39.420 --> 05:40.010 Oz. 05:40.050 --> 05:41.160 Oz here. 05:42.770 --> 05:50.150 So besides acting as your access point to the shell, the prompt can provide additional helpful information. 05:50.270 --> 05:57.230 Here in this example, the current user ID named Typhoon here. 05:58.410 --> 05:59.710 Uh, is shown in the prompt. 05:59.730 --> 06:01.860 Also, the name of the system is shown here. 06:01.860 --> 06:03.800 As you can see in this case, it's Oxley. 06:03.810 --> 06:05.090 This is our host name. 06:05.100 --> 06:09.990 So you will learn later in this section about additional items shown in the prompt here. 06:09.990 --> 06:15.520 So if you are new to the command line interface, keep in mind that after you type in a shell command 06:15.540 --> 06:22.650 prompt, you need to press the enter key to for the shell to act upon your command. 06:22.650 --> 06:32.760 For example, if I write like LHS here and I need to press enter to execute my command line interface 06:32.760 --> 06:33.390 command. 06:33.390 --> 06:39.270 So think of the Shell command line interface as a helpmate, assisting you with your Linux system, 06:39.270 --> 06:45.120 giving you helpful insights and letting you know when the shell is ready for new commands as another 06:45.120 --> 06:48.630 helpful item in the shell is the Bash manual. 06:48.630 --> 06:52.080 In the next lecture, you will learn about the Bash manual in Linux. 06:52.080 --> 06:54.090 So I'm waiting you in the next lecture.