Difference between revisions of "BOSS-Linux/C2/Basic-Commands/English-timed"
From Script | Spoken-Tutorial
PoojaMoolya (Talk | contribs) (Created page with "{| border=1 |'''Time''' |'''Narration''' |- |00:00 |Dear friends, welcome to a spoken tutorial on the '''Linux Operating System. ''' |- |00:05 |In this tutorial, we will study...") |
PoojaMoolya (Talk | contribs) |
||
Line 4: | Line 4: | ||
|- | |- | ||
|00:00 | |00:00 | ||
− | |Dear friends, welcome to a spoken tutorial on the | + | |Dear friends, welcome to a spoken tutorial on the Linux Operating System. |
|- | |- | ||
|00:05 | |00:05 | ||
Line 10: | Line 10: | ||
|- | |- | ||
|00:10 | |00:10 | ||
− | |I am using | + | |I am using Ubuntu 10.04. |
|- | |- | ||
|00:12 | |00:12 | ||
Line 22: | Line 22: | ||
|- | |- | ||
|00:33 | |00:33 | ||
− | |Then we will learn about how to find help in Linux using the | + | |Then we will learn about how to find help in Linux using the man command. |
|- | |- | ||
|00:39 | |00:39 | ||
Line 30: | Line 30: | ||
|In simplest terms we can say that Linux commands are words that when keyed in cause some actions to take place. | |In simplest terms we can say that Linux commands are words that when keyed in cause some actions to take place. | ||
|- | |- | ||
− | |00: | + | |00:52 |
− | |Linux commands are seldom more than four character in length like | + | |Linux commands are seldom more than four character in length like ls, who, ps etc. |
|- | |- | ||
|00:59 | |00:59 | ||
Line 37: | Line 37: | ||
|- | |- | ||
|01:05 | |01:05 | ||
− | |Go to the | + | |Go to the applications menu. |
|- | |- | ||
|01:08 | |01:08 | ||
− | |Select | + | |Select accessories and then click on terminal from the available options |
|- | |- | ||
|01:14 | |01:14 | ||
+ | |or press ctrl alt t on your keyboard to open a terminal window. | ||
+ | |- | ||
+ | |01:20 | ||
|Now we can see a prompt ($) and a cursor blinking next to it. This is where we need to type in a command. | |Now we can see a prompt ($) and a cursor blinking next to it. This is where we need to type in a command. | ||
|- | |- | ||
− | |01: | + | |01:29 |
− | |Type in the words | + | |Type in the words who and press enter. |
|- | |- | ||
− | |01: | + | |01:34 |
− | |We can see the name of the users logged in. Actually we have just executed a command called | + | |We can see the name of the users logged in. Actually we have just executed a command called who which shows who are logged into the system. |
|- | |- | ||
− | |01: | + | |01:47 |
|But which entity is converting these commands which are nothing more than a few letters into actions? | |But which entity is converting these commands which are nothing more than a few letters into actions? | ||
|- | |- | ||
− | |01: | + | |01:54 |
|This is the job of the Command Interpreter, also called the shell. | |This is the job of the Command Interpreter, also called the shell. | ||
|- | |- | ||
− | |01: | + | |01:59 |
|We can define a shell as a program that acts as the interface between us and the Linux system, | |We can define a shell as a program that acts as the interface between us and the Linux system, | ||
|- | |- | ||
− | |02: | + | |02:08 |
|allowing us to enter commands for the operating system to execute. | |allowing us to enter commands for the operating system to execute. | ||
|- | |- | ||
− | |02: | + | |02:13 |
|On Linux it’s quite feasible to have multiple shells installed, with different users able to pick the one they prefer. | |On Linux it’s quite feasible to have multiple shells installed, with different users able to pick the one they prefer. | ||
|- | |- | ||
− | |02: | + | |02:22 |
− | |On Linux, the standard shell that is always installed as | + | |On Linux, the standard shell that is always installed as /bin/sh is called bash, the GNU Bourne-Again SHell, from the GNU suite of tools. |
|- | |- | ||
− | |02: | + | |02:35 |
|The commands we would be covering in this tutorial are generic and can run on most of the Linux shells with slight variations. | |The commands we would be covering in this tutorial are generic and can run on most of the Linux shells with slight variations. | ||
|- | |- | ||
− | |02: | + | |02:44 |
|Nevertheless, we would be using the bash as the shell for demonstration in this tutorial. | |Nevertheless, we would be using the bash as the shell for demonstration in this tutorial. | ||
|- | |- | ||
− | |02: | + | |02:51 |
− | |It is because bash is the most popular shell and portable to almost all | + | |It is because bash is the most popular shell and portable to almost all UNIX. |
|- | |- | ||
− | |02: | + | |02:58 |
− | |Other shells include the | + | |Other shells include the Bourne shell which is the original Unix shell, C Shell and Korn shell |
− | + | ||
− | + | ||
− | + | ||
|- | |- | ||
|03:08 | |03:08 | ||
− | |and type the command | + | |To see which shell we are using |
+ | |- | ||
+ | |03:11 | ||
+ | |go to the terminal and type the command echo space dollar in capital SHELL and press enter | ||
|- | |- | ||
− | |03: | + | |03:27 |
− | |Normally the output is | + | |Normally the output is /bin/bash which gives us the bash shell. |
|- | |- | ||
− | |03: | + | |03:34 |
|There are ways by which we can activate different shells. Those will be covered in an advanced tutorial. | |There are ways by which we can activate different shells. Those will be covered in an advanced tutorial. | ||
|- | |- | ||
− | |03: | + | |03:42 |
|Commands are actually files containing programs, often written in C. | |Commands are actually files containing programs, often written in C. | ||
|- | |- | ||
− | |03: | + | |03:47 |
− | |These files are contained in directories. To find out where a command is stored, we can use the | + | |These files are contained in directories. To find out where a command is stored, we can use the type command. |
|- | |- | ||
− | |03: | + | |03:55 |
− | | Type at the command prompt | + | | Type at the command prompt. Type--space-- ps and press enter. |
− | + | ||
− | + | ||
− | + | ||
|- | |- | ||
|04:03 | |04:03 | ||
+ | |This shows that ps is actually a file stored in the /bin directory. | ||
+ | |- | ||
+ | |04:09 | ||
|When we key in a command at the command prompt, the shell searches for a file matching the command name in a list of directories. | |When we key in a command at the command prompt, the shell searches for a file matching the command name in a list of directories. | ||
|- | |- | ||
− | |04: | + | |04:18 |
|If it is found, then the program corresponding to that file is executed, else a “command not found” error is given. | |If it is found, then the program corresponding to that file is executed, else a “command not found” error is given. | ||
|- | |- | ||
− | |04: | + | |04:27 |
− | |The list of directories searched is specified by the | + | |The list of directories searched is specified by the PATH variable, as we will see later. |
|- | |- | ||
− | |04: | + | |04:34 |
− | |For now, if we want to see this list, just type the command | + | |For now, if we want to see this list, just type the command echo space dollar PATH |
|- | |- | ||
− | |04: | + | |04:44 |
− | |and press enter | + | |in capital and press enter |
|- | |- | ||
− | |04: | + | |04:52 |
|Talking of commands, there is one important thing that we need to know. | |Talking of commands, there is one important thing that we need to know. | ||
|- | |- | ||
− | |04: | + | |04:57 |
− | |Linux commands are of two types: | + | |Linux commands are of two types: External commands and internal commands. |
|- | |- | ||
− | | | + | |05:02 |
− | |Now | + | |Now external commands are those which exist as separate files/programs. |
|- | |- | ||
− | |05: | + | |05:07 |
|Most commands in Linux are of this nature. But there are some commands whose implementation is written within the shell and they do not exist as separate files. | |Most commands in Linux are of this nature. But there are some commands whose implementation is written within the shell and they do not exist as separate files. | ||
|- | |- | ||
− | |05: | + | |05:18 |
− | |These are | + | |These are internal commands. |
|- | |- | ||
− | |05: | + | |05:20 |
− | |The | + | |The echo command, which we will see later, is in fact an internal command. |
|- | |- | ||
− | |05: | + | |05:25 |
|Go to the terminal and type at the command, | |Go to the terminal and type at the command, | ||
|- | |- | ||
− | |05: | + | |05:33 |
− | | | + | |type space echo and press enter. |
|- | |- | ||
− | |05: | + | |05:40 |
− | |The output shows | + | |The output shows echo as a shell built-in. |
|- | |- | ||
|05:43 | |05:43 | ||
− | |So instead of giving a file name it shows that the | + | |So instead of giving a file name it shows that the echo command's implementation is internal to the shell. So it is called internal command. |
|- | |- | ||
− | |05: | + | |05:56 |
|Another important thing which we need to understand is the structure of commands. | |Another important thing which we need to understand is the structure of commands. | ||
|- | |- | ||
− | | | + | |06:01 |
|Commands can be of one word or multiple words, separated by white spaces. | |Commands can be of one word or multiple words, separated by white spaces. | ||
|- | |- | ||
− | |06: | + | |06:08 |
− | |In the second case the first word is the actual name of the command while the other words are the | + | |In the second case the first word is the actual name of the command while the other words are the arguments. |
|- | |- | ||
− | |06: | + | |06:16 |
− | | | + | |Arguments can be options or expressions or file names. |
|- | |- | ||
− | |06: | + | |06:20 |
|A command can perform different tasks depending on the option specified. | |A command can perform different tasks depending on the option specified. | ||
|- | |- | ||
− | |06: | + | |06:26 |
− | |They are generally preceded by a single or double minus sign, called short and long option, respectively. | + | |They are generally preceded by a single or double minus sign(-), called short and long option, respectively. |
|- | |- | ||
− | |06: | + | |06:35 |
|Go to the terminal window and type the commands and see their outputs. | |Go to the terminal window and type the commands and see their outputs. | ||
|- | |- | ||
− | |06: | + | |06:40 |
− | |Type | + | |Type clear to clear the terminal window |
− | + | ||
− | + | ||
− | + | ||
|- | |- | ||
− | |06: | + | |06:44 |
− | | | + | |Then type ls and press enter |
|- | |- | ||
|06:49 | |06:49 | ||
− | | | + | |Again, type clear and press enter |
|- | |- | ||
− | |06: | + | |06:55 |
− | |Type | + | |Type ls space minus a and enter. |
|- | |- | ||
|07:04 | |07:04 | ||
− | | | + | |Type clear to clear the terminal window |
|- | |- | ||
− | |07: | + | |07:11 |
− | | | + | |Now type ls space minus minus all and press enter. |
|- | |- | ||
− | |07: | + | |07:19 |
− | | | + | |Again, type clear to clear the terminal . |
|- | |- | ||
− | |07: | + | |07:23 |
+ | |Now type ls space minus d and press enter. | ||
+ | |- | ||
+ | |07:32 | ||
|At this point it is enough to understand how the command's behavior changes with change of options | |At this point it is enough to understand how the command's behavior changes with change of options | ||
|- | |- | ||
− | |07: | + | |07:40 |
|In Linux we have a larger number of commands, | |In Linux we have a larger number of commands, | ||
|- | |- | ||
− | |07: | + | |07:45 |
|each of which have many different options. | |each of which have many different options. | ||
|- | |- | ||
− | |07: | + | |07:48 |
|Commands can also be combined together as we will see later. So how do we keep so much in mind? | |Commands can also be combined together as we will see later. So how do we keep so much in mind? | ||
|- | |- | ||
− | |07: | + | |07:55 |
|In reality you don't have to. This is because of the excellent online help facility available in Linux. | |In reality you don't have to. This is because of the excellent online help facility available in Linux. | ||
− | |||
− | |||
− | |||
|- | |- | ||
|08:01 | |08:01 | ||
− | | | + | |The man command provides documentation on just about every available command on the system. |
|- | |- | ||
− | |08: | + | |08:08 |
− | | | + | |For instance, to know about say, the ls command, all you have to do is to go to the terminal |
− | + | ||
|- | |- | ||
− | |08: | + | |08:16 |
− | | | + | |and type man command with ls as argument that is type man space ls and press enter |
|- | |- | ||
− | |08: | + | |08:30 |
− | | | + | |Press q to come out. |
|- | |- | ||
− | |08: | + | |08:35 |
− | | | + | |man is the system’s manual pager. Each argument given to man is normally the name of a program, utility or function. |
|- | |- | ||
|08:43 | |08:43 | ||
− | | | + | |The manual page associated with each of these arguments is then found and displayed. |
|- | |- | ||
|08:49 | |08:49 | ||
+ | |A section, if provided, will direct man to look only in that section of the manual. | ||
+ | |- | ||
+ | |08:55 | ||
|The default is to search in all of the available sections, following a pre-defined order and to show only the first page found, even if page exists in several sections. | |The default is to search in all of the available sections, following a pre-defined order and to show only the first page found, even if page exists in several sections. | ||
− | |||
− | |||
− | |||
|- | |- | ||
|09:07 | |09:07 | ||
− | | | + | |You can use man command to know more about the command man itself. |
|- | |- | ||
− | |09: | + | |09:14 |
− | | | + | |Go to the terminal and type man space man and press enter. |
− | + | ||
− | + | ||
− | + | ||
|- | |- | ||
|09:23 | |09:23 | ||
+ | |Press q to come out of it. | ||
+ | |- | ||
+ | |09:26 | ||
+ | |man command has many options. | ||
+ | |- | ||
+ | |09:30 | ||
|Here let me tell the most useful ones. Sometimes we know what we want to do but do not know the exact command. Then what can we do? | |Here let me tell the most useful ones. Sometimes we know what we want to do but do not know the exact command. Then what can we do? | ||
|- | |- | ||
− | |09: | + | |09:41 |
− | | | + | |man provides the -k option which takes a keyword and return a list of commands and their brief purpose. |
|- | |- | ||
− | |09: | + | |09:50 |
|For example, create a directory, we may not know the exact command, | |For example, create a directory, we may not know the exact command, | ||
|- | |- | ||
− | |09: | + | |09:56 |
− | | so we can go to the command prompt and type | + | | so we can go to the command prompt and type man space minus k space directories and press enter. |
|- | |- | ||
− | |10: | + | |10:12 |
|Now we can search each of these commands to see what we actually need. | |Now we can search each of these commands to see what we actually need. | ||
|- | |- | ||
− | |10: | + | |10:17 |
− | |The same thing can be achieved using | + | |The same thing can be achieved using apropos command. |
|- | |- | ||
− | |10: | + | |10:21 |
− | |Type at the command prompt | + | |Type at the command prompt apropos space directories and press enter to see the output. |
|- | |- | ||
− | |10: | + | |10:36 |
|Some times we do not need too much details. We only need to know what a command does. | |Some times we do not need too much details. We only need to know what a command does. | ||
|- | |- | ||
− | |10: | + | |10:40 |
− | |In that case we can use the | + | |In that case we can use the whatis command or man -f. Both give one line description about the command. |
|- | |- | ||
− | |10: | + | |10:52 |
− | |Go to the terminal | + | |Go to the terminal type clear to clear the terminal window |
|- | |- | ||
− | |10: | + | |10:58 |
− | |now type | + | |now type whatis space ls and press enter |
|- | |- | ||
− | | | + | |11:06 |
|Some commands have many options. We may want to obtain a list of the different options that a command has. | |Some commands have many options. We may want to obtain a list of the different options that a command has. | ||
|- | |- | ||
− | |11: | + | |11:13 |
− | |Then we use the | + | |Then we use the minus help option. |
|- | |- | ||
− | |11: | + | |11:18 |
− | |Go to the command prompt and type | + | |Go to the command prompt and type ls space minus minus help and press enter |
|- | |- | ||
− | |11: | + | |11:29 |
− | |I will scroll up so that | + | |I will scroll up so that u can see all the options on this manual page |
|- | |- | ||
− | |11: | + | |11:45 |
|Thats it for this part of the Linux Spoken tutorial. Spoken Tutorials are a part of the Talk to a Teacher project, supported by the National Mission on Education through ICT. | |Thats it for this part of the Linux Spoken tutorial. Spoken Tutorials are a part of the Talk to a Teacher project, supported by the National Mission on Education through ICT. | ||
|- | |- | ||
− | |11: | + | |11:56 |
|More information on the same is available at the following link . | |More information on the same is available at the following link . | ||
|- | |- | ||
− | | | + | |12:00 |
− | | | + | | This script has been contributed by ----------------------(name of the translator) and this is -----------------------(name of the recorder) from --------------------------(name of the place)signing off. Good bye |
|} | |} |
Revision as of 12:27, 4 December 2014
Time | Narration |
00:00 | Dear friends, welcome to a spoken tutorial on the Linux Operating System. |
00:05 | In this tutorial, we will study some basic commands. |
00:10 | I am using Ubuntu 10.04. |
00:12 | We assume that you know how to get started with the Linux operating system. |
00:17 | If you are interested, it is available through another spoken tutorial, on the website http://spoken-tutorial.org. |
00:26 | In this tutorial, we will see what are commands and what is a command interpreter. |
00:33 | Then we will learn about how to find help in Linux using the man command. |
00:39 | Now the first question is, "what are commands?". |
00:43 | In simplest terms we can say that Linux commands are words that when keyed in cause some actions to take place. |
00:52 | Linux commands are seldom more than four character in length like ls, who, ps etc. |
00:59 | The commands are in lower case and they are case sensitive. Let us see an example . |
01:05 | Go to the applications menu. |
01:08 | Select accessories and then click on terminal from the available options |
01:14 | or press ctrl alt t on your keyboard to open a terminal window. |
01:20 | Now we can see a prompt ($) and a cursor blinking next to it. This is where we need to type in a command. |
01:29 | Type in the words who and press enter. |
01:34 | We can see the name of the users logged in. Actually we have just executed a command called who which shows who are logged into the system. |
01:47 | But which entity is converting these commands which are nothing more than a few letters into actions? |
01:54 | This is the job of the Command Interpreter, also called the shell. |
01:59 | We can define a shell as a program that acts as the interface between us and the Linux system, |
02:08 | allowing us to enter commands for the operating system to execute. |
02:13 | On Linux it’s quite feasible to have multiple shells installed, with different users able to pick the one they prefer. |
02:22 | On Linux, the standard shell that is always installed as /bin/sh is called bash, the GNU Bourne-Again SHell, from the GNU suite of tools. |
02:35 | The commands we would be covering in this tutorial are generic and can run on most of the Linux shells with slight variations. |
02:44 | Nevertheless, we would be using the bash as the shell for demonstration in this tutorial. |
02:51 | It is because bash is the most popular shell and portable to almost all UNIX. |
02:58 | Other shells include the Bourne shell which is the original Unix shell, C Shell and Korn shell |
03:08 | To see which shell we are using |
03:11 | go to the terminal and type the command echo space dollar in capital SHELL and press enter |
03:27 | Normally the output is /bin/bash which gives us the bash shell. |
03:34 | There are ways by which we can activate different shells. Those will be covered in an advanced tutorial. |
03:42 | Commands are actually files containing programs, often written in C. |
03:47 | These files are contained in directories. To find out where a command is stored, we can use the type command. |
03:55 | Type at the command prompt. Type--space-- ps and press enter. |
04:03 | This shows that ps is actually a file stored in the /bin directory. |
04:09 | When we key in a command at the command prompt, the shell searches for a file matching the command name in a list of directories. |
04:18 | If it is found, then the program corresponding to that file is executed, else a “command not found” error is given. |
04:27 | The list of directories searched is specified by the PATH variable, as we will see later. |
04:34 | For now, if we want to see this list, just type the command echo space dollar PATH |
04:44 | in capital and press enter |
04:52 | Talking of commands, there is one important thing that we need to know. |
04:57 | Linux commands are of two types: External commands and internal commands. |
05:02 | Now external commands are those which exist as separate files/programs. |
05:07 | Most commands in Linux are of this nature. But there are some commands whose implementation is written within the shell and they do not exist as separate files. |
05:18 | These are internal commands. |
05:20 | The echo command, which we will see later, is in fact an internal command. |
05:25 | Go to the terminal and type at the command, |
05:33 | type space echo and press enter. |
05:40 | The output shows echo as a shell built-in. |
05:43 | So instead of giving a file name it shows that the echo command's implementation is internal to the shell. So it is called internal command. |
05:56 | Another important thing which we need to understand is the structure of commands. |
06:01 | Commands can be of one word or multiple words, separated by white spaces. |
06:08 | In the second case the first word is the actual name of the command while the other words are the arguments. |
06:16 | Arguments can be options or expressions or file names. |
06:20 | A command can perform different tasks depending on the option specified. |
06:26 | They are generally preceded by a single or double minus sign(-), called short and long option, respectively. |
06:35 | Go to the terminal window and type the commands and see their outputs. |
06:40 | Type clear to clear the terminal window |
06:44 | Then type ls and press enter |
06:49 | Again, type clear and press enter |
06:55 | Type ls space minus a and enter. |
07:04 | Type clear to clear the terminal window |
07:11 | Now type ls space minus minus all and press enter. |
07:19 | Again, type clear to clear the terminal . |
07:23 | Now type ls space minus d and press enter. |
07:32 | At this point it is enough to understand how the command's behavior changes with change of options |
07:40 | In Linux we have a larger number of commands, |
07:45 | each of which have many different options. |
07:48 | Commands can also be combined together as we will see later. So how do we keep so much in mind? |
07:55 | In reality you don't have to. This is because of the excellent online help facility available in Linux. |
08:01 | The man command provides documentation on just about every available command on the system. |
08:08 | For instance, to know about say, the ls command, all you have to do is to go to the terminal |
08:16 | and type man command with ls as argument that is type man space ls and press enter |
08:30 | Press q to come out. |
08:35 | man is the system’s manual pager. Each argument given to man is normally the name of a program, utility or function. |
08:43 | The manual page associated with each of these arguments is then found and displayed. |
08:49 | A section, if provided, will direct man to look only in that section of the manual. |
08:55 | The default is to search in all of the available sections, following a pre-defined order and to show only the first page found, even if page exists in several sections. |
09:07 | You can use man command to know more about the command man itself. |
09:14 | Go to the terminal and type man space man and press enter. |
09:23 | Press q to come out of it. |
09:26 | man command has many options. |
09:30 | Here let me tell the most useful ones. Sometimes we know what we want to do but do not know the exact command. Then what can we do? |
09:41 | man provides the -k option which takes a keyword and return a list of commands and their brief purpose. |
09:50 | For example, create a directory, we may not know the exact command, |
09:56 | so we can go to the command prompt and type man space minus k space directories and press enter. |
10:12 | Now we can search each of these commands to see what we actually need. |
10:17 | The same thing can be achieved using apropos command. |
10:21 | Type at the command prompt apropos space directories and press enter to see the output. |
10:36 | Some times we do not need too much details. We only need to know what a command does. |
10:40 | In that case we can use the whatis command or man -f. Both give one line description about the command. |
10:52 | Go to the terminal type clear to clear the terminal window |
10:58 | now type whatis space ls and press enter |
11:06 | Some commands have many options. We may want to obtain a list of the different options that a command has. |
11:13 | Then we use the minus help option. |
11:18 | Go to the command prompt and type ls space minus minus help and press enter |
11:29 | I will scroll up so that u can see all the options on this manual page |
11:45 | Thats it for this part of the Linux Spoken tutorial. Spoken Tutorials are a part of the Talk to a Teacher project, supported by the National Mission on Education through ICT. |
11:56 | More information on the same is available at the following link . |
12:00 | This script has been contributed by ----------------------(name of the translator) and this is -----------------------(name of the recorder) from --------------------------(name of the place)signing off. Good bye |