Difference between revisions of "Linux/C3/The-sed-command/English-timed"

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|-
 
|-
 
| 00:01
 
| 00:01
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|  Welcome to this spoken tutorial on the sed - the stream editor.
+
|  Welcome to this spoken tutorial on '''sed''' - the '''stream editor'''.
  
 
|-
 
|-
 
| 00:05
 
| 00:05
−
|  In this tutorial we will learn usage of '''sed '''command.
+
|  In this tutorial, we will learn usage of '''sed '''command.
  
 
|-
 
|-
 
|  00:11
 
|  00:11
−
|We will do through some examples
+
|We will do this through some examples.
  
 
|-
 
|-
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|-
 
|-
 
| 00:16
 
| 00:16
−
|I am using'''Ubuntu Linux'''  version 12.04''' Operating System''' and '''GNU BASH''' version 4.2.24
+
|I am using '''Ubuntu Linux'''  version 12.04''' Operating System''' and '''GNU BASH''' version 4.2.24
  
 
|-
 
|-
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|-
 
|-
 
| 00:34
 
| 00:34
−
| As prerequisites
+
| As prerequisites,
  
 
|-
 
|-
 
| 00:36  
 
| 00:36  
−
|You should know Basics of linux terminal
+
|you should know basics of Linux terminal.
  
 
|-
 
|-
 
| 00:39  
 
| 00:39  
−
|For relevant tutorials please visit our website which as shown: http://spoken-tutorial.org  
+
|For relevant tutorials please visit our website which is as shown: http://spoken-tutorial.org  
  
 
|-
 
|-
 
| 00:45
 
| 00:45
−
| Let us with an introduction to '''sed'''
+
| Let us start with an introduction to '''sed''':
  
 
|-
 
|-
 
|00:48
 
|00:48
−
|'''sed''' is a stream editor.  
+
|'''sed''' is a '''stream editor'''.  
  
 
|-
 
|-
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|-
 
|-
 
|  00:58
 
|  00:58
−
|It performs some display or editing function
+
|It performs some display or editing function-
  
 
|-
 
|-
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|-
 
|-
 
| 01:10
 
| 01:10
−
| Let us first start with some examples.
+
| Let us start with some examples.
  
 
|-
 
|-
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|-
 
|-
 
|  01:19
 
|  01:19
−
|I have a file called '''seddemo.txt''' in home directory version.  
+
|I have a file called '''seddemo.txt''' in '''home directory''' version.  
  
−
|-
+
|-
−
| 01:24
+
| 01:24
−
|Let us view its content.
+
|Let us view its contents.
  
 
|-
 
|-
 
|  01:26
 
|  01:26
−
|In this file we have some enteries like roll no, name, stream, marks, pass or fail and the stipend amount.
+
|In this file we have some entries like '''roll no, name, stream, marks, pass or fail''' and the '''stipend amount'''.
  
 
|-
 
|-
 
| 01:39
 
| 01:39
−
|Now suppose we want to print the second line of the file.
+
|Now, suppose we want to '''print''' the second line of the file.
  
 
|-
 
|-
 
|  01:44
 
|  01:44
−
|For this we need to oepn the terminal by pressing
+
|For this, we need to open the terminal by pressing '''Ctrl + Alt''' and '''T''' keys simultaneously on your keyboard.
−
CTRL + ALT and T keys simultaneously on your keyboard.
+
  
 
|-
 
|-
 
| 01:53
 
| 01:53
−
|Now Type
+
|Now type:
  
 
|-
 
|-
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|-
 
|-
 
|  02:03
 
|  02:03
−
|Press '''Enter'''
+
|Press '''Enter'''.
  
 
|-
 
|-
 
| 02:06
 
| 02:06
−
|Here '''2''' denotes the location which is the second line.
+
|Here, '''2''' denotes the location which is the second line.
  
 
|-
 
|-
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|-
 
|-
 
|  02:25
 
|  02:25
−
|This is the default behaviour of the action '''p'''.
+
|This is the default behavior of the action '''p'''.
  
 
|-
 
|-
 
| 02:29
 
| 02:29
−
|To only print the second line
+
|To only print the second line,
  
 
|-
 
|-
 
| 02:31  
 
| 02:31  
−
|Type
+
|type:
  
 
|-
 
|-
 
|  02:33
 
|  02:33
−
|'''sed '''space  '''-n''' space (Within single quotes) '''2p''' after the single quotes space '''seddemo.txt '''
+
|'''sed''' space  '''-n''' space (Within single quotes) '''2p''' after the single quotes space '''seddemo.txt '''
  
 
|-
 
|-
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|-
 
|-
 
|  02:58
 
|  02:58
−
|Then we give the location in the stream that we want to edit or display.  
+
|Then we give the location in the '''stream''' that we want to edit or display.  
  
 
|-
 
|-
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|-
 
|-
 
|  03:07
 
|  03:07
−
|'''p''' indicates the action we want to take ie to print the second line.
+
|'''p''' indicates the action we want to take i.e to print the second line.
  
 
|-
 
|-
 
|  03:12
 
|  03:12
−
|And '''seddemo.txt''' is the name of the file
+
|And '''seddemo.txt''' is the name of the file.
  
 
|-
 
|-
 
|  03:18
 
|  03:18
−
|This is the general syntax of sed command.
+
|This is the general syntax of '''sed command'''.
  
 
|-
 
|-
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|-
 
|-
 
|03:26
 
|03:26
−
|Let me clear the promt
+
|Let me clear the prompt.
  
 
|-
 
|-
 
|  03:29
 
|  03:29
−
|Now Type
+
|Now type:
  
 
|-
 
|-
Line 182: Line 181:
 
|-
 
|-
 
|  03:42
 
|  03:42
−
|Press '''Enter'''.
+
|Press '''Enter'''.We see that the last line is printed.
−
 
+
−
|-
+
−
|  03:43
+
−
|We see that the last line is printed.
+
  
 
|-
 
|-
 
|  03:49
 
|  03:49
−
|Now come back to text editor.
+
|Now come back to our text editor.
  
 
|-
 
|-
 
| 03:51
 
| 03:51
−
| Suppose we want to print the enteries from 3rd to 6th
+
| Suppose we want to print the entries from 3rd to 6th.
  
 
|-
 
|-
 
| 03:57  
 
| 03:57  
−
|For this we need to type on the terminal:  
+
|For this, we need to type on the terminal:  
  
 
|-
 
|-
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|-
 
|-
 
|  04:14
 
|  04:14
−
|'''Press Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
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|-
 
|-
 
|  04:28
 
|  04:28
−
|Say if we had to print all lines except from 3rd to 6th we will type:
+
|Say, if we had to print all lines except from 3rd to 6th we will type:
 
'''sed''' space  '''-n''' space within single quotes ‘'''3''' (comma) ''',6''' (exclamation mark) '''!p'''  
 
'''sed''' space  '''-n''' space within single quotes ‘'''3''' (comma) ''',6''' (exclamation mark) '''!p'''  
  
 
|-
 
|-
 
| 04:44
 
| 04:44
−
|After the single quotes space '''seddemo.txt '''
+
|after the single quotes space '''seddemo.txt '''
  
 
|-
 
|-
 
|  04:51
 
|  04:51
−
|'''Press''' '''Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
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|-
 
|-
 
|  04:58
 
|  04:58
−
|Line addressing and context addressing.
+
|'''Line addressing''' and '''context addressing'''.
  
 
|-
 
|-
Line 247: Line 242:
 
|-
 
|-
 
|  05:09
 
|  05:09
−
|This is known as line addressing.
+
|This is known as ''line addressing''-
  
 
|-
 
|-
 
|  05:12
 
|  05:12
−
|Address specified by the line numbers.
+
|address specified by the line numbers.
  
 
|-
 
|-
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|-
 
|-
 
| 05:18  
 
| 05:18  
−
|Another way of addressing is '''Context addressing'''
+
|Another way of addressing is ''Context addressing''-
  
 
|-
 
|-
 
|  05:22
 
|  05:22
−
|Lines that contain particular context say a particular word.
+
|lines that contain particular context say a particular word.
  
 
|-
 
|-
 
|  05:28
 
|  05:28
−
|If we want to take actions on lines that contain a particular word we use context addressing.
+
|If we want to take actions on lines that contain a particular word, we use ''context addressing''.
  
 
|-
 
|-
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|-
 
|-
 
|  05:42
 
|  05:42
−
|Come back to our editor.
+
|Come back to our text editor.
  
 
|-
 
|-
 
| 05:44
 
| 05:44
−
|  Say we want to print those lines which have the word '''computers'''.
+
|  Say, we want to print those lines which have the word '''computers'''.
  
 
|-
 
|-
 
|  05:50
 
|  05:50
−
|Come back to our temrinal.
+
|Come back to our terminal.
  
 
|-
 
|-
 
|  05:53
 
|  05:53
−
|Now Type
+
|Now type:'''sed''' space  '''-n''' space within single quotes front slash (opening square bracket) [cC] (Closing Square bracket)  omputers/p after the single quotes'''space '''seddemo.txt '''
−
 
+
−
|-
+
−
|  05:54
+
−
|'''sed''' space  '''-n''' space (within single quotes) (front slash)(opening square bracket) [cC] (Closing Square bracket)  omputers/p after the single quotes'''space '''seddemo.txt '''
+
  
 
|-
 
|-
 
|  06:20
 
|  06:20
−
|'''Press''' '''Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
 
|  06:23
 
|  06:23
−
|We see the lines with the word computers is displayed.
+
|We see the lines with the word "computers" is displayed.
  
 
|-
 
|-
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|-
 
|-
 
| 06:36  
 
| 06:36  
−
|When we need to match patterns the pattern needs to be typed between front slashes.
+
|When we need to match patterns, the pattern needs to be typed between front slashes.
  
 
|-
 
|-
 
| 06:43
 
| 06:43
−
| We can print it in file as well using the '''w''' option.  
+
| We can print it in a file as well, using the '''w''' option.  
  
 
|-
 
|-
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|-
 
|-
 
|  06:52
 
|  06:52
−
|'''sed''' space '''-n''' space (within single quotes) (front slash) (opening square bracket)  '''[cC] (closing square bracket)Computers/w''' space '''computer_student.txt''' after the space '''seddemo.txt '''
+
|'''sed''' space '''-n''' space within single quotes front-slash (opening square bracket)  '''[cC] (closing square bracket) omputers/w''' space '''computer_student.txt''' after the single quotes space '''seddemo.txt '''
  
 
|-
 
|-
 
|  07:18
 
|  07:18
−
|'''Press''' '''Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
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|-
 
|-
 
|  07:31
 
|  07:31
−
| Type '''cat''' space '''computer_student'''.txt
+
| Type: '''cat''' space '''computer_student.txt'''
  
 
|-
 
|-
 
|  07:38
 
|  07:38
−
|'''Press Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
 
|  07:42
 
|  07:42
−
|We see the entries
+
|We see the entries.We can also have patterns that we can write to different files.  
−
 
+
−
|-
+
−
| 07:43
+
−
| We can also have patterns that we can write to different files.  
+
  
 
|-
 
|-
 
|  07:50
 
|  07:50
−
| Let us clear the promt
+
| Let us clear the prompt.
  
 
|-
 
|-
 
|  07:52
 
|  07:52
−
| Type '''sed''' space '''-n''' space '''-e''' space (within single quotes) (front slash) '''‘/electronics/w''' space '''electro.txt’''' after the single quotes '''-e''' space (within single quotes) (front slash) '''‘/civil/w''' space '''civil.txt’''' after the single quote  space '''seddemo.txt '''
+
| Type: '''sed''' space '''-n''' space '''-e''' space (within single quotes) (front slash) '''‘/electronics/w''' space '''electro.txt’''' after the single quotes space '''-e''' space (within single quotes) (front slash) '''‘/civil/w''' space '''civil.txt’''' after the single quote  space '''seddemo.txt '''
  
 
|-
 
|-
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|-
 
|-
 
|  08:28
 
|  08:28
−
|Here '''-e''' is used to combine multiple methods''' '''
+
|Here '''-e''' is used to combine multiple methods.
  
 
|-
 
|-
Line 379: Line 366:
 
|-
 
|-
 
|08:41
 
|08:41
−
| To see what they contain type:
+
| To see what they contain, type:
  
 
|-
 
|-
Line 387: Line 374:
 
|-
 
|-
 
|  08:49
 
|  08:49
−
|This will display the enteries with the word electronics.
+
|This will display the entries with the word "electronics".
−
 
+
  
 
|-
 
|-
 
|  08:54
 
|  08:54
−
|Let us see the content of civil file.
+
|Let us see the contents of civil file.
  
 
|-
 
|-
 
|  08:58
 
|  08:58
−
| Type '''cat '''space''' civil.txt'''
+
| Type: '''cat''' space ''' civil.txt'''
  
 
|-
 
|-
 
|  09:01
 
|  09:01
−
|''' press Enter'''
+
| press '''Enter'''.
  
 
|-
 
|-
 
|  09:03
 
|  09:03
−
|This will display the enteries having the word civil.
+
|This will display the entries having the word "civil".
  
 
|-
 
|-
Line 420: Line 406:
 
|-
 
|-
 
|09:18
 
|09:18
−
|Let us switch back to our slide
+
|Let us switch back to our slide.
  
 
|-
 
|-
Line 428: Line 414:
 
|-
 
|-
 
|  09:22
 
|  09:22
−
|In this tutorial we learnt,sed
+
|In this tutorial we learnt, '''sed''':
  
 
|-
 
|-
 
|  09:25
 
|  09:25
−
|To print using sed.
+
| To print using '''sed''', '''Line Addressing''',
−
 
+
−
|-
+
−
|  09:26
+
−
|Line Addressing.
+
  
 
|-
 
|-
 
|  09:27
 
|  09:27
−
|Context Addressing.
+
| '''Context Addressing'''.
  
 
|-
 
|-
Line 448: Line 430:
 
|-
 
|-
 
|  09:32
 
|  09:32
−
|Use the same text file '''seddemo.txt.'''
+
|use the same text file '''seddemo.txt''',
  
 
|-
 
|-
 
|  09:35
 
|  09:35
−
|Try to print records from 6th to 12th line.
+
|try to print records from 6th to 12th line.
  
 
|-
 
|-
 
| 09:40
 
| 09:40
−
| Watch the video available at the link shown below
+
| Watch the video available at the link shown below.
  
 
|-
 
|-
 
|  09:42
 
|  09:42
−
|It summarises the Spoken Tutorial project
+
|It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
 
|  09:46
 
|  09:46
−
|If you do not have good bandwidth, you can download and watch it
+
|If you do not have good bandwidth, you can download and watch it.
  
 
|-
 
|-
 
| 09:51
 
| 09:51
−
|  The Spoken Tutorial Project Team
+
|  The Spoken Tutorial Project Team:
  
 
|-
 
|-
Line 476: Line 458:
 
|-
 
|-
 
| 09:55  
 
| 09:55  
−
|Gives certificates to those who pass an online test
+
|Gives certificates to those who pass an online test.
  
 
|-
 
|-
 
|  10:00
 
|  10:00
−
|For more details, please write tocontact@spoken-tutorial.org
+
|For more details, please write tocontact@spoken-tutorial.org.
  
 
|-
 
|-
 
| 10:07
 
| 10:07
−
|  Spoken Tutorial Project is a part of the Talk to a Teacher project
+
|  Spoken Tutorial Project is a part of the Talk to a Teacher project.
  
 
|-
 
|-
 
|  10:11
 
|  10:11
−
|It is supported by the National Mission on Education through ICT, MHRD, Government of India
+
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.
  
 
|-
 
|-
 
|  10:18
 
|  10:18
−
|More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro
+
|More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro.
  
 
|-
 
|-
 
| 10:25
 
| 10:25
−
|This is Ashwini from IIT Bombay signing off . Thank You for joining.
+
|This is Ashwini Patil from IIT Bombay, signing off . Thank You for joining.
  
 
|}
 
|}

Latest revision as of 15:17, 24 August 2017

Time Narration
00:01 Welcome to this spoken tutorial on sed - the stream editor.
00:05 In this tutorial, we will learn usage of sed command.
00:11 We will do this through some examples.
00:14 To record this tutorial,
00:16 I am using Ubuntu Linux version 12.04 Operating System and GNU BASH version 4.2.24
00:26 Please note, GNU bash version 4 or above is recommended to practice this tutorial.
00:34 As prerequisites,
00:36 you should know basics of Linux terminal.
00:39 For relevant tutorials please visit our website which is as shown: http://spoken-tutorial.org
00:45 Let us start with an introduction to sed:
00:48 sed is a stream editor.
00:51 sed finds some pattern of text in a particular location of a file.
00:58 It performs some display or editing function-
01:02 editing function like insertion, substitution and deletion in matched text.
01:10 Let us start with some examples.
01:13 We will see how to print using the sed command.
01:19 I have a file called seddemo.txt in home directory version.
01:24 Let us view its contents.
01:26 In this file we have some entries like roll no, name, stream, marks, pass or fail and the stipend amount.
01:39 Now, suppose we want to print the second line of the file.
01:44 For this, we need to open the terminal by pressing Ctrl + Alt and T keys simultaneously on your keyboard.
01:53 Now type:
01:55 sed space within single quotes ‘2p’ after the single quotes space seddemo.txt
02:03 Press Enter.
02:06 Here, 2 denotes the location which is the second line.
02:11 p denotes the action, which is printing(p).
02:16 Now Look at the output.
02:18 It shows the entire file but see that the second line is printed twice.
02:25 This is the default behavior of the action p.
02:29 To only print the second line,
02:31 type:
02:33 sed space -n space (Within single quotes) 2p after the single quotes space seddemo.txt
02:44 Press Enter.
02:46 We see only the second line as printed.
02:51 -n stands for ‘silent mode’ which will suppress all unnecessary output.
02:58 Then we give the location in the stream that we want to edit or display.
03:03 We want to select the second line.
03:07 p indicates the action we want to take i.e to print the second line.
03:12 And seddemo.txt is the name of the file.
03:18 This is the general syntax of sed command.
03:21 Now let us print the last line of the file.
03:26 Let me clear the prompt.
03:29 Now type:
03:32 sed space -n space within single quotes (dollar) $p after the single quotes space seddemo.txt
03:42 Press Enter.We see that the last line is printed.
03:49 Now come back to our text editor.
03:51 Suppose we want to print the entries from 3rd to 6th.
03:57 For this, we need to type on the terminal:
04:00 sed space -n space within single quotes 3 (comma) ,6p’ space seddemo.txt
04:14 Press Enter.
04:16 The output is displayed from the third line to the sixth line.
04:21 Any of the actions can be reversed by using the exclamation mark before the action.
04:28 Say, if we had to print all lines except from 3rd to 6th we will type:

sed space -n space within single quotes ‘3 (comma) ,6 (exclamation mark) !p

04:44 after the single quotes space seddemo.txt
04:51 Press Enter.
04:53 The output is displayed.
04:56 Let us switch back to our slides.
04:58 Line addressing and context addressing.
05:03 So far, we specified the lines in the file on which the action needs to be taken.
05:09 This is known as line addressing-
05:12 address specified by the line numbers.
05:15 This is one way of addressing.
05:18 Another way of addressing is Context addressing-
05:22 lines that contain particular context say a particular word.
05:28 If we want to take actions on lines that contain a particular word, we use context addressing.
05:36 Regular expressions can be used.
05:39 Let us see an example.
05:42 Come back to our text editor.
05:44 Say, we want to print those lines which have the word computers.
05:50 Come back to our terminal.
05:53 Now type:sed space -n space within single quotes front slash (opening square bracket) [cC] (Closing Square bracket) omputers/p after the single quotesspace seddemo.txt
06:20 Press Enter.
06:23 We see the lines with the word "computers" is displayed.
06:28 We write pattern within square brackets.
06:31 This is to match any one or both of the characters within square brackets.
06:36 When we need to match patterns, the pattern needs to be typed between front slashes.
06:43 We can print it in a file as well, using the w option.
06:50 For this type:
06:52 sed space -n space within single quotes front-slash (opening square bracket) [cC] (closing square bracket) omputers/w space computer_student.txt after the single quotes space seddemo.txt
07:18 Press Enter.
07:21 Now all the matching lines would be transferred to the file computer_student.txt.
07:27 Let us view the content of computer_student
07:31 Type: cat space computer_student.txt
07:38 Press Enter.
07:42 We see the entries.We can also have patterns that we can write to different files.
07:50 Let us clear the prompt.
07:52 Type: sed space -n space -e space (within single quotes) (front slash) ‘/electronics/w space electro.txt’ after the single quotes space -e space (within single quotes) (front slash) ‘/civil/w space civil.txt’ after the single quote space seddemo.txt
08:24 Press Enter
08:28 Here -e is used to combine multiple methods.
08:34 This would create two files electro.txt and civil.txt.
08:41 To see what they contain, type:
08:43 cat space electro.txt
08:49 This will display the entries with the word "electronics".
08:54 Let us see the contents of civil file.
08:58 Type: cat space civil.txt
09:01 press Enter.
09:03 This will display the entries having the word "civil".
09:08 We will see some more set of commands in another tutorial.
09:12 I will use the same program.
09:14 This brings us to the end of this tutorial.
09:18 Let us switch back to our slide.
09:20 we will summarize,
09:22 In this tutorial we learnt, sed:
09:25 To print using sed, Line Addressing,
09:27 Context Addressing.
09:30 As an assignment,
09:32 use the same text file seddemo.txt,
09:35 try to print records from 6th to 12th line.
09:40 Watch the video available at the link shown below.
09:42 It summarizes the Spoken Tutorial project.
09:46 If you do not have good bandwidth, you can download and watch it.
09:51 The Spoken Tutorial Project Team:
09:53 Conducts workshops using spoken tutorials
09:55 Gives certificates to those who pass an online test.
10:00 For more details, please write tocontact@spoken-tutorial.org.
10:07 Spoken Tutorial Project is a part of the Talk to a Teacher project.
10:11 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
10:18 More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro.
10:25 This is Ashwini Patil from IIT Bombay, signing off . Thank You for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14

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