Pratik kamble at 07:06, 24 March 2017

2017-03-24T07:06:43Z

Sandhya.np14 at 15:22, 13 August 2015

2015-08-13T15:22:32Z

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Sandhya.np14 at 06:47, 13 August 2015

2015-08-13T06:47:40Z

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PoojaMoolya at 07:35, 12 February 2015

2015-02-12T07:35:06Z

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PoojaMoolya at 07:34, 12 February 2015

2015-02-12T07:34:47Z

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PoojaMoolya at 07:22, 12 February 2015

2015-02-12T07:22:47Z

PoojaMoolya: Created page with "{| border =1 |'''Time''' |'''Narration''' |- | 00:01 | Welcome to this spoken tutorial on '''sed''' - the stream editor. |- | 00:07 | In this tutorial we will learn usage..."

2015-02-12T07:21:13Z

Created page with "{| border =1 |'''Time''' |'''Narration''' |- | 00:01 | Welcome to this spoken tutorial on '''sed''' - the stream editor. |- | 00:07 | In this tutorial we will learn usage..."

New page

{| border =1
|'''Time'''
|'''Narration'''

|-
| 00:01
| Welcome to this spoken tutorial on '''sed''' - the stream editor.

|-
| 00:07
| 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 using '''Linux''' ''' 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.

|-
| 00:33
| As prerequisites

|-
| 00:35
|You should know Basics of linux terminal

|-
| 00:38
|For relevant tutorials please visit our website which as shown: http://spoken-tutorial.org

|-
| 00:44
| Let us with an introduction to '''sed'''

|-
|00:47
|'''sed''' is a stream editor.

|-
| 00:50
|'''sed''' finds some pattern of text in a particular location of a file.

|-
| 00:57
|It performs some display or editing function

|-
| 01:01
|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.

|-
| 01:18
|I have a file called '''seddemo.txt''' in home directory version.

|-
| 01:23
|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.

|-
| 01:38
|Now suppose we want to print the second line of the file.

|-
| 01:43
|For this we need to open the terminal

|-
| 01:47
|Now Type

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| 01:48
|'''sed''' space within single quotes ‘'''2p’''' after the single quotes space '''seddemo.txt'''

|-
| 01:57
|Press '''Enter'''

|-
| 02:00
|Here '''2''' denotes the location which is the second line.

|-
| 02:05
|'''p''' denotes the action, which is printing('''p''').

|-
| 02:09
|Now Look at the output.

|-
| 02:11
|It shows the entire file but see that the second line is printed twice.

|-
| 02:18
|This is the default behaviour of the action '''p'''.

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| 02:22
|To only print the second line

|-
| 02:25
|Type '''sed '''space '''-n''' space (Within single quotes) '''2p''' after the single quotes space '''seddemo.txt '''

|-
| 02:37
|Press '''Enter.'''

|-
|02:40
|We see only the second line as printed.

|-
| 02:44
| '''-n''' stands for ‘silent mode’ which will suppress all unnecessary output.

|-
| 02:51
|Then we give the location in the stream that we want to edit or display.

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| 02:57
|We want to select the second line.

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| 03:00
|'''p''' indicates the action we want to take ie to print the second line.

|-
| 03:06
|And '''seddemo.txt''' is the name of the file

|-
| 03:11
|This is the general syntax of sed command.

|-
| 03:15
|Now let us print the last line of the file.

|-
|03:20
|Let me clear the promt

|-
| 03:24
|Now Type

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| 03:25
|'''sed''' space '''-n''' space within single quotes (dollar) '''$p''' after the single quotes space '''seddemo.txt '''

|-
| 03:36
|Press '''Enter'''.

|-
| 03:39
|We see that the last line is printed.

|-
| 03:42
|Now come back to text editor.

|-
| 03:45
| Suppose we want to print the enteries from 3rd to 6th

|-
| 03:50
|For this we need to type on the terminal:

|-
| 03:54
|'''sed''' space '''-n''' space within single quotes '''3''' (comma) ''',6p’''' space '''seddemo.txt '''

|-
| 04:07
|'''Press Enter.'''

|-
| 04:09
|The output is displayed from the third line to the sixth line.

|-
| 04:14
| Any of the actions can be reversed by using the exclamation mark before the action.

|-
| 04:21
|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'''

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| 04:38
|After the single quotes space '''seddemo.txt '''

|-
| 04:45
|'''Press''' '''Enter.'''

|-
| 04:46
|The output is displayed.

|-
| 04:49
|Let us switch back to our slides.

|-
| 04:52
|Line addressing and context addressing.

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| 04:56
| So far, we specified the lines in the file on which the action needs to be taken.

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| 05:02
|This is known as line addressing.

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| 05:05
|Address specified by the line numbers.

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| 05:08
|This is one way of addressing.

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| 05:11
|Another way of addressing is '''Context addressing'''

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| 05:16
|Lines that contain particular context say a particular word.

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| 05:21
|If we want to take actions on lines that contain a particular word we use context addressing.

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| 05:29
|Regular expressions can be used.

|-
| 05:32
|Let us see an example.

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| 05:35
|Come back to our editor.

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| 05:38
| Say we want to print those lines which have the word '''computers'''.

|-
| 05:44
|Come back to our terminal.

|-
| 05:46
|Now Type

|-
| 05:48
|'''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
|'''Press''' '''Enter.'''

|-
| 06:16
|We see the lines with the word computers is displayed.

|-
| 06:22
|We write pattern within square brackets.

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| 06:24
|This is to match any one or both of the characters within square brackets.

|-
| 06:30
|When we need to match patterns the pattern needs to be typed between front slashes.

|-
| 06:37
| We can print it in file as well using the '''w''' option.

|-
| 06:43
|For this type:

|-
| 06:44
|'''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 '''

|-
| 07:11
|'''Press''' '''Enter.'''

|-
| 07:14
|Now all the matching lines would be transferred to the file '''computer_student.txt'''.

|-
| 07:21
| Let us view the content

|-
| 07:25
| Type '''cat''' space '''computer_student'''.txt

|-
| 07:32
|'''Press Enter.'''

|-
| 07:35
|We see the entries

|-
| 07:37
| We can also have patterns that we can write to different files.

|-
| 07:42
| Let us clear the promt

|-
| 07:45
| 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 '''

|-
| 08:18
|Press '''Enter'''

|-
| 08:22
|Here '''-e''' is used to combine multiple methods''' '''

|-
|08:27
|This would create two files '''electro.txt''' and '''civil.txt'''.

|-
|08:34
| To see what they contain type:

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| 08:37
|'''cat '''space''' electro.txt'''

|-
| 08:42
|This will display the enteries with the word electronics.

|-
| 08:47
|Let us see the content of civil file.

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| 08:50
| Type '''cat '''space''' civil.txt'''

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| 08:55
|''' press Enter'''

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| 08:57
|This will display the enteries having the word civil.

|-
| 09:01
| We will see some more set of commands in another tutorial.

|-
| 09:05
|I will use the same program.

|-
|09:08
|This brings us to the end of this tutorial.

|-
|09:11
|Let us switch back to our slide

|-
| 09:14
| we will summarize,

|-
| 09:15
|In this tutorial we learnt,sed

|-
| 09:18
|To print using '''sed.'''

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| 09:19
|Line Addressing.

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| 09:21
|Context Addressing.

|-
| 09:23
| As an assignment,

|-
| 09:25
|Use the same text file '''seddemo.txt.'''

|-
| 09:28
|Try to print records from 6th to 12th line.

|-
| 09:33
| Watch the video available at the link shown below

|-
| 09:36
|It summarises the Spoken Tutorial project

|-
| 09:39
|If you do not have good bandwidth, you can download and watch it

|-
| 09:44
| The Spoken Tutorial Project Team

|-
| 09:46
|Conducts workshops using spoken tutorials

|-
| 09:49
|Gives certificates to those who pass an online test

|-
| 09:53
|For more details, please write to contact@spoken-tutorial.org

|-
| 10:00
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
| 10:04
|It is supported by the National Mission on Education through ICT, MHRD, Government of India

|-
| 10:11
|More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro

|-
| 10:17
|This is Ashwini Patil from IIT Bombay signing off . Thank You for joining.

|}

@@ Line 89: / Line 89: @@
 |-
 | 01:47
-|Now, type:
+|Now, type:'''sed''' space within  single quotes '''2p''' after the single quotes space '''seddemo.txt'''
-−
-|-
-| 01:48
-|'''sed''' space within  single quotes '''2p''' after the single quotes space '''seddemo.txt'''
 |-
@@ Line 169: / Line 165: @@
 |-
 |  03:24
-|Now, type:
+|Now, type: '''sed''' space  '''-n''' space within single quotes dollar-sign '''p''' after the single quotes space '''seddemo.txt '''
-−
-|-
-| 03:25
-|'''sed''' space  '''-n''' space within single quotes dollar-sign '''p''' after the single quotes space '''seddemo.txt '''
 |-
@@ Line 213: / Line 205: @@
 |-
 |  04:21
-|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'''
 |-
@@ Line 222: / Line 213: @@
 |-
 |  04:45
-|Press '''Enter.'''
+|Press '''Enter.'''The output is displayed.
-−
-|-
-|  04:46
-|The output is displayed.
 |-
@@ Line 314: / Line 301: @@
 |-
 | 06:37
-| We can print it in a file as well using the '''w''' option.
+| We can print it in a file as well using the '''w''' option. For this, type:
-−
-|-
-|  06:43
-|For this, type:
 |-
@@ Line 418: / Line 401: @@
 |-
 | 09:14
-| we will  summarize.
+| we will  summarize.In this tutorial, we learnt: '''sed'''
-−
-|-
-|  09:15
-|In this tutorial, we learnt: '''sed'''
 |-
 |  09:18
-|* To print using '''sed.'''
+|To print using '''sed.'''Line Addressing.
-−
-|-
-|  09:19
-|* Line Addressing.
 |-
 |  09:21
-|* Context Addressing.
+|Context Addressing.
 |-

@@ Line 290: / Line 290: @@
 |-
 |  05:48
-|'''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 '''
 |-

BOSS-Linux/C3/The-sed-command/English-timed - Revision history

Pratik kamble at 07:06, 24 March 2017

Sandhya.np14 at 15:22, 13 August 2015

Sandhya.np14 at 06:47, 13 August 2015

PoojaMoolya at 07:35, 12 February 2015

PoojaMoolya at 07:34, 12 February 2015

PoojaMoolya at 07:22, 12 February 2015

PoojaMoolya: Created page with "{| border =1 |'''Time''' |'''Narration''' |- | 00:01 | Welcome to this spoken tutorial on '''sed''' - the stream editor. |- | 00:07 | In this tutorial we will learn usage..."