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

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|-
 
|-
 
| 00:01
 
| 00:01
−
|  Welcome to this spoken tutorial on '''sed''' - the stream editor.
+
|  Welcome to this spoken tutorial on the sed - the stream editor.
  
 
|-
 
|-
−
| 00:07
+
| 00:05
 
|  In this tutorial  we will learn usage of '''sed '''command.
 
|  In this tutorial  we will learn usage of '''sed '''command.
  
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|-
 
|-
 
| 00:16
 
| 00:16
−
|I am using '''Linux''' ''' 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
  
 
|-
 
|-
Line 28: Line 28:
  
 
|-
 
|-
−
| 00:33
+
| 00:34
 
| As prerequisites
 
| As prerequisites
  
 
|-
 
|-
−
| 00:35
+
| 00:36
 
|You should know Basics of linux terminal
 
|You should know Basics of linux terminal
  
 
|-
 
|-
−
| 00:38
+
| 00:39
 
|For relevant tutorials please visit our website which as shown: http://spoken-tutorial.org  
 
|For relevant tutorials please visit our website which as shown: http://spoken-tutorial.org  
  
 
|-
 
|-
−
| 00:44
+
| 00:45
 
| Let us with an introduction to '''sed'''
 
| Let us with an introduction to '''sed'''
  
 
|-
 
|-
−
|00:47
+
|00:48
 
|'''sed''' is a stream editor.  
 
|'''sed''' is a stream editor.  
  
 
|-
 
|-
−
| 00:50
+
| 00:51
 
|'''sed''' finds some pattern of text in a particular location of a file.  
 
|'''sed''' finds some pattern of text in a particular location of a file.  
  
 
|-
 
|-
−
|  00:57
+
|  00:58
 
|It performs some display or editing function
 
|It performs some display or editing function
  
 
|-
 
|-
−
| 01:01
+
| 01:02
 
|editing function like insertion, substitution and deletion in matched text.
 
|editing function like insertion, substitution and deletion in matched text.
  
Line 68: Line 68:
  
 
|-
 
|-
−
|  01:18
+
|  01:19
 
|I have a file called '''seddemo.txt''' in home directory version.  
 
|I have a file called '''seddemo.txt''' in home directory version.  
  
−
|-
+
|-
−
| 01:23
+
| 01:24
−
|Let us view its content.
+
|Let us view its content.
  
 
|-
 
|-
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|-
 
|-
−
| 01:38
+
| 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.
  
 
|-
 
|-
−
|  01:43
+
|  01:44
−
|For this we need to open the terminal  
+
|For this we need to oepn the terminal by pressing
 +
CTRL + ALT and T keys simultaneously on your keyboard.
  
 
|-
 
|-
−
| 01:47
+
| 01:53
 
|Now Type
 
|Now Type
  
 
|-
 
|-
−
| 01:48
+
| 01:55
 
|'''sed''' space within  single quotes ‘'''2p’''' after the single quotes space '''seddemo.txt'''
 
|'''sed''' space within  single quotes ‘'''2p’''' after the single quotes space '''seddemo.txt'''
  
 
|-
 
|-
−
|  01:57
+
|  02:03
 
|Press '''Enter'''
 
|Press '''Enter'''
  
 
|-
 
|-
−
| 02:00
+
| 02:06
 
|Here '''2''' denotes the location which is the second line.
 
|Here '''2''' denotes the location which is the second line.
  
 
|-
 
|-
−
|  02:05
+
|  02:11
 
|'''p''' denotes the action, which is printing('''p''').
 
|'''p''' denotes the action, which is printing('''p''').
  
 
|-
 
|-
−
| 02:09
+
| 02:16
 
|Now Look at the output.
 
|Now Look at the output.
  
 
|-
 
|-
−
|  02:11
+
|  02:18
 
|It shows the entire file but see that the second line is printed twice.
 
|It shows the entire file but see that the second line is printed twice.
  
 
|-
 
|-
−
|  02:18
+
|  02:25
 
|This is the default behaviour of the action '''p'''.
 
|This is the default behaviour of the action '''p'''.
  
 
|-
 
|-
−
| 02:22
+
| 02:29
 
|To only print the second line
 
|To only print the second line
  
 
|-
 
|-
−
| 02:25
+
| 02:31
−
|Type '''sed '''space  '''-n''' space (Within single quotes) '''2p''' after the single quotes space '''seddemo.txt '''
+
|Type
  
 
|-
 
|-
−
|  02:37
+
|  02:33
 +
|'''sed '''space  '''-n''' space (Within single quotes) '''2p''' after the single quotes space '''seddemo.txt '''
 +
 
 +
|-
 +
|  02:44
 
|Press '''Enter.'''
 
|Press '''Enter.'''
  
 
|-
 
|-
−
|02:40
+
|02:46
 
|We see only the second line as printed.
 
|We see only the second line as printed.
  
 
|-
 
|-
−
| 02:44
+
| 02:51
 
| '''-n''' stands for ‘silent mode’ which will suppress all unnecessary output.
 
| '''-n''' stands for ‘silent mode’ which will suppress all unnecessary output.
  
 
|-
 
|-
−
|  02:51
+
|  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.  
  
 
|-
 
|-
−
|  02:57
+
|  03:03
 
|We want to select the second line.
 
|We want to select the second line.
  
 
|-
 
|-
−
|  03:00
+
|  03:07
 
|'''p''' indicates the action we want to take ie to print the second line.
 
|'''p''' indicates the action we want to take ie to print the second line.
  
 
|-
 
|-
−
|  03:06
+
|  03:12
 
|And '''seddemo.txt''' is the name of the file
 
|And '''seddemo.txt''' is the name of the file
  
 
|-
 
|-
−
|  03:11
+
|  03:18
 
|This is the general syntax of sed command.
 
|This is the general syntax of sed command.
  
 
|-
 
|-
−
| 03:15
+
| 03:21
 
|Now let us print the last line of the file.
 
|Now let us print the last line of the file.
  
 
|-
 
|-
−
|03:20
+
|03:26
 
|Let me clear the promt
 
|Let me clear the promt
  
 
|-
 
|-
−
|  03:24
+
|  03:29
 
|Now Type  
 
|Now Type  
  
 
|-
 
|-
−
| 03:25
+
| 03:32
 
|'''sed''' space  '''-n''' space within single quotes (dollar) '''$p''' after the single quotes space '''seddemo.txt '''
 
|'''sed''' space  '''-n''' space within single quotes (dollar) '''$p''' after the single quotes space '''seddemo.txt '''
  
 
|-
 
|-
−
|  03:36
+
|  03:42
 
|Press '''Enter'''.
 
|Press '''Enter'''.
  
 
|-
 
|-
−
|  03:39
+
|  03:43
 
|We see that the last line is printed.
 
|We see that the last line is printed.
  
 
|-
 
|-
−
|  03:42
+
|  03:49
 
|Now come back to text editor.
 
|Now come back to text editor.
  
 
|-
 
|-
−
| 03:45
+
| 03:51
 
| Suppose we want to print the enteries from 3rd to 6th
 
| Suppose we want to print the enteries from 3rd to 6th
  
 
|-
 
|-
−
| 03:50
+
| 03:57
 
|For this we need to type on the terminal:  
 
|For this we need to type on the terminal:  
  
 
|-
 
|-
−
|  03:54
+
|  04:00
 
|'''sed''' space  '''-n''' space within single quotes '''3''' (comma) ''',6p’''' space '''seddemo.txt '''
 
|'''sed''' space  '''-n''' space within single quotes '''3''' (comma) ''',6p’''' space '''seddemo.txt '''
  
 
|-
 
|-
−
|  04:07
+
|  04:14
 
|'''Press Enter.'''
 
|'''Press Enter.'''
  
 
|-
 
|-
−
|  04:09
+
|  04:16
 
|The output is displayed from the third line to the sixth line.
 
|The output is displayed from the third line to the sixth line.
  
 
|-
 
|-
−
| 04:14
+
| 04:21
 
| Any of the actions can be reversed by using the exclamation mark before the action.
 
| Any of the actions can be reversed by using the exclamation mark before the action.
  
 
|-
 
|-
−
|  04:21
+
|  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'''  
  
 
|-
 
|-
−
| 04:38
+
| 04:44
 
|After the single quotes space '''seddemo.txt '''
 
|After the single quotes space '''seddemo.txt '''
  
 
|-
 
|-
−
|  04:45
+
|  04:51
 
|'''Press''' '''Enter.'''
 
|'''Press''' '''Enter.'''
  
 
|-
 
|-
−
|  04:46
+
|  04:53
 
|The output is displayed.
 
|The output is displayed.
  
 
|-
 
|-
−
|  04:49
+
|  04:56
 
|Let us switch back to our slides.
 
|Let us switch back to our slides.
  
 
|-
 
|-
−
|  04:52
+
|  04:58
 
|Line addressing and context addressing.
 
|Line addressing and context addressing.
  
 
|-
 
|-
−
| 04:56
+
| 05:03
 
| So far, we specified the lines in the file on which the action needs to be taken.
 
| So far, we specified the lines in the file on which the action needs to be taken.
  
 
|-
 
|-
−
|  05:02
+
|  05:09
 
|This is known as line addressing.  
 
|This is known as line addressing.  
  
 
|-
 
|-
−
|  05:05
+
|  05:12
 
|Address specified by the line numbers.
 
|Address specified by the line numbers.
  
 
|-
 
|-
−
|  05:08
+
|  05:15
 
|This is one way of addressing.
 
|This is one way of addressing.
  
 
|-
 
|-
−
| 05:11
+
| 05:18
 
|Another way of addressing is '''Context addressing'''
 
|Another way of addressing is '''Context addressing'''
  
 
|-
 
|-
−
|  05:16
+
|  05:22
 
|Lines that contain particular context say a particular word.
 
|Lines that contain particular context say a particular word.
  
 
|-
 
|-
−
|  05:21
+
|  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.
  
 
|-
 
|-
−
|  05:29
+
|  05:36
 
|Regular expressions can be used.  
 
|Regular expressions can be used.  
  
 
|-
 
|-
−
|  05:32
+
|  05:39
 
|Let us see an example.
 
|Let us see an example.
  
 
|-
 
|-
−
|  05:35
+
|  05:42
 
|Come back to our editor.
 
|Come back to our editor.
  
 
|-
 
|-
−
| 05:38
+
| 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'''.
  
 
|-
 
|-
−
|  05:44
+
|  05:50
−
|Come back to our terminal.
+
|Come back to our temrinal.
  
 
|-
 
|-
−
|  05:46
+
|  05:53
 
|Now Type
 
|Now Type
  
 
|-
 
|-
−
|  05:48
+
|  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 '''
+
|'''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 '''
  
 
|-
 
|-
−
|  06:14
+
|  06:20
 
|'''Press''' '''Enter.'''
 
|'''Press''' '''Enter.'''
  
 
|-
 
|-
−
|  06:16
+
|  06:23
 
|We see the lines with the word computers is displayed.
 
|We see the lines with the word computers is displayed.
  
 
|-
 
|-
−
|  06:22
+
|  06:28
 
|We write pattern within square brackets.  
 
|We write pattern within square brackets.  
  
 
|-
 
|-
−
|  06:24
+
|  06:31
 
|This is to match any one or both of the characters within square brackets.
 
|This is to match any one or both of the characters within square brackets.
  
 
|-
 
|-
−
| 06:30
+
| 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.
  
 
|-
 
|-
−
| 06:37
+
| 06:43
 
| We can print it in file as well using the '''w''' option.  
 
| We can print it in file as well using the '''w''' option.  
  
 
|-
 
|-
−
|  06:43
+
|  06:50
 
|For this type:
 
|For this type:
  
 
|-
 
|-
−
|  06:44
+
|  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 '''
+
|'''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 '''
  
 
|-
 
|-
−
|  07:11
+
|  07:18
 
|'''Press''' '''Enter.'''
 
|'''Press''' '''Enter.'''
  
 
|-
 
|-
−
|  07:14
+
|  07:21
 
|Now all the matching lines would be transferred to the file '''computer_student.txt'''.  
 
|Now all the matching lines would be transferred to the file '''computer_student.txt'''.  
  
 
|-
 
|-
−
| 07:21
+
| 07:27
−
| Let us view the content
+
| Let us view the content of '''computer_student'''
  
 
|-
 
|-
−
|  07:25
+
|  07:31
 
| Type '''cat''' space '''computer_student'''.txt
 
| Type '''cat''' space '''computer_student'''.txt
  
 
|-
 
|-
−
|  07:32
+
|  07:38
 
|'''Press Enter.'''
 
|'''Press Enter.'''
  
 
|-
 
|-
−
|  07:35
+
|  07:42
 
|We see the entries
 
|We see the entries
  
 
|-
 
|-
−
| 07:37
+
| 07:43
 
| We can also have patterns that we can write to different files.  
 
| We can also have patterns that we can write to different files.  
  
 
|-
 
|-
−
|  07:42
+
|  07:50
 
| Let us clear the promt  
 
| Let us clear the promt  
  
 
|-
 
|-
−
|  07:45
+
|  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 '''
+
| 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 '''
  
 
|-
 
|-
−
|  08:18
+
|  08:24
 
|Press '''Enter'''
 
|Press '''Enter'''
  
 
|-
 
|-
−
|  08:22
+
|  08:28
 
|Here '''-e''' is used to combine multiple methods''' '''
 
|Here '''-e''' is used to combine multiple methods''' '''
  
 
|-
 
|-
−
|08:27
+
|08:34
 
|This would create two files '''electro.txt''' and '''civil.txt'''.  
 
|This would create two files '''electro.txt''' and '''civil.txt'''.  
  
 
|-
 
|-
−
|08:34
+
|08:41
 
| To see what they contain type:
 
| To see what they contain type:
  
 
|-
 
|-
−
|  08:37
+
|  08:43
 
|'''cat '''space''' electro.txt'''  
 
|'''cat '''space''' electro.txt'''  
  
 
|-
 
|-
−
|  08:42
+
|  08:49
 
|This will display the enteries with the word electronics.
 
|This will display the enteries with the word electronics.
  
 
|-
 
|-
−
|  08:47
+
|  08:54
 
|Let us see the content of civil file.
 
|Let us see the content of civil file.
  
 
|-
 
|-
−
|  08:50
+
|  08:58
 
| Type '''cat '''space''' civil.txt'''
 
| Type '''cat '''space''' civil.txt'''
  
 
|-
 
|-
−
|  08:55
+
|  09:01
 
|''' press Enter'''
 
|''' press Enter'''
  
 
|-
 
|-
−
|  08:57
+
|  09:03
 
|This will display the enteries having the word civil.
 
|This will display the enteries having the word civil.
  
 
|-
 
|-
−
| 09:01
+
| 09:08
 
| We will see some more set of commands in another tutorial.
 
| We will see some more set of commands in another tutorial.
  
 
|-
 
|-
−
|  09:05
+
|  09:12
 
|I will use the same program.
 
|I will use the same program.
  
 
|-
 
|-
−
|09:08
+
|09:14
 
|This brings us to the end of this tutorial.
 
|This brings us to the end of this tutorial.
  
 
|-
 
|-
−
|09:11
+
|09:18
 
|Let us switch back to our slide
 
|Let us switch back to our slide
  
 
|-
 
|-
−
| 09:14
+
| 09:20
 
| we will  summarize,
 
| we will  summarize,
  
 
|-
 
|-
−
|  09:15
+
|  09:22
 
|In this tutorial we learnt,sed
 
|In this tutorial we learnt,sed
  
 
|-
 
|-
−
|  09:18
+
|  09:25
−
|To print using '''sed.'''
+
|To print using sed.
  
 
|-
 
|-
−
|  09:19
+
|  09:26
 
|Line Addressing.  
 
|Line Addressing.  
  
 
|-
 
|-
−
|  09:21
+
|  09:27
 
|Context Addressing.
 
|Context Addressing.
  
 
|-
 
|-
−
| 09:23
+
| 09:30
 
|  As an assignment,
 
|  As an assignment,
  
 
|-
 
|-
−
|  09:25
+
|  09:32
 
|Use the same text file '''seddemo.txt.'''
 
|Use the same text file '''seddemo.txt.'''
  
 
|-
 
|-
−
|  09:28
+
|  09:35
 
|Try to print records from 6th to 12th line.
 
|Try to print records from 6th to 12th line.
  
 
|-
 
|-
−
| 09:33
+
| 09:40
 
| Watch the video available at the link shown below
 
| Watch the video available at the link shown below
  
 
|-
 
|-
−
|  09:36
+
|  09:42
 
|It summarises the Spoken Tutorial project
 
|It summarises the Spoken Tutorial project
  
 
|-
 
|-
−
|  09:39
+
|  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
  
 
|-
 
|-
−
| 09:44
+
| 09:51
 
|  The Spoken Tutorial Project Team
 
|  The Spoken Tutorial Project Team
  
 
|-
 
|-
−
|  09:46
+
|  09:53
 
|Conducts workshops using spoken tutorials
 
|Conducts workshops using spoken tutorials
  
 
|-
 
|-
−
| 09:49
+
| 09:55
 
|Gives certificates to those who pass an online test
 
|Gives certificates to those who pass an online test
  
 
|-
 
|-
−
|  09:53
+
|  10:00
−
|For more details, please write to contact@spoken-tutorial.org
+
|For more details, please write tocontact@spoken-tutorial.org
  
 
|-
 
|-
−
| 10:00
+
| 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
  
 
|-
 
|-
−
|  10:04
+
|  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
  
 
|-
 
|-
−
|  10:11
+
|  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
  
 
|-
 
|-
−
| 10:17
+
| 10:25
 
|This is Ashwini Patil from IIT Bombay signing off . Thank You for joining.
 
|This is Ashwini Patil from IIT Bombay signing off . Thank You for joining.
  
 
|}
 
|}

Revision as of 13:04, 12 February 2015

Time Narration
00:01 Welcome to this spoken tutorial on the sed - the stream editor.
00:05 In this tutorial we will learn usage of sed command.
00:11 We will do through some examples
00:14 To record this tutorial,
00:16 I am usingUbuntu 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 as shown: http://spoken-tutorial.org
00:45 Let us 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 first 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 content.
01:26 In this file we have some enteries 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 oepn 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 behaviour 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 ie 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 promt
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.
03:43 We see that the last line is printed.
03:49 Now come back to text editor.
03:51 Suppose we want to print the enteries 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 editor.
05:44 Say we want to print those lines which have the word computers.
05:50 Come back to our temrinal.
05:53 Now Type
05:54 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 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)Computers/w space computer_student.txt after the 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
07:43 We can also have patterns that we can write to different files.
07:50 Let us clear the promt
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
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 enteries with the word electronics.
08:54 Let us see the content of civil file.
08:58 Type cat space civil.txt
09:01 press Enter
09:03 This will display the enteries 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.
09:26 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 summarises 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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