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

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|-
 
|-
 
|  00:06
 
|  00:06
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|  In this tutorial, we will learn some '''More on sed '''commands, through some examples.
+
|  In this tutorial, we will learn some more on '''sed commands''' through some examples.
  
 
|-
 
|-
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|-
 
|-
 
|  00:37
 
|  00:37
−
| You should be aware of sed tool.
+
| You should be aware of '''sed''' tool.
  
 
|-
 
|-
 
|  00:40
 
|  00:40
−
| 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
  
 
|-
 
|-
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|-
 
|-
 
|  00:55
 
|  00:55
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|  Let's first look at the original file '''seddemo.txt'''
+
|  Let's first look at the original file '''seddemo.txt'''.
  
 
|-
 
|-
 
|  01:01
 
|  01:01
−
|  Notice the word '''Kumar''' occurs two times in the fourth line and once in the sixth line.
+
|  Notice that the word "Kumar" occurs two times in the fourth line and once in the sixth line.
  
 
|-
 
|-
 
|  01:10
 
|  01:10
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| If you want to replace all occurrences of '''‘Kumar’''' with '''‘Roy’'''
+
| If you want to replace all occurrences of "Kumar" with "Roy",
  
 
|-
 
|-
 
|  01:16
 
|  01:16
−
|Type on the '''terminal'''
+
|type on the '''terminal''':
  
 
|-
 
|-
 
|  01:18
 
|  01:18
−
| '''sed space''' within single quote ''''s front slash / opening square bracket small ''k'' capital ''K''   closing square bracket umar  slash Roy slash'''' after the single quotes space '''seddemo.txt'''
+
| '''sed space''' within single quote '''s front slash / opening square bracket small k capital K  closing square bracket umar  slash Roy slash''' after the single quotes space '''seddemo.txt'''
  
 
|-
 
|-
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|-
 
|-
 
|  01:46
 
|  01:46
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| Only the first occurrence of '''Kumar''' is changed to '''Roy''', not the second one.
+
| Only the first occurrence of "Kumar" is changed to "Roy", not the second one.
  
 
|-
 
|-
 
|  01:52
 
|  01:52
−
| Sixth line had one occurrence of the word '''Kumar''' and this is replaced now.
+
| Sixth line had one occurrence of the word "Kumar" and this is replaced now.
  
 
|-
 
|-
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|-
 
|-
 
|  02:11
 
|  02:11
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|  To substitute all the matched entries we need to use the flag ''' g''' option.
+
|  To substitute all the matched entries we need to use the '''flag  g''' option.
  
 
|-
 
|-
 
|  02:17
 
|  02:17
−
|  Let me clear the '''prompt. '''
+
|  Let me clear the prompt.  
  
 
|-
 
|-
 
|  02:20
 
|  02:20
 
| Type:
 
| Type:
−
  '''sed space within single quotes 's front slash opening square bracket ''small k'' ''capital K'' closing square bracket umar slash Roy slash g'''' after the single quote space '''seddemo.txt''' Press '''Enter'''
+
  '''sed space''' (within single quotes)''' 's front-slash opening square bracket small k capital K closing square bracket umar slash Roy slash g' ''' after the single quote space '''seddemo.txt'''. Press '''Enter'''.
  
 
|-
 
|-
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|-
 
|-
 
|  02:53
 
|  02:53
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| Say we want to replace the words '''electronics''' with the word '''electrical'''
+
| Say, we want to replace the word "electronics" with the word "electrical"
  
 
|-
 
|-
 
|  02:58
 
|  02:58
−
| And '''civil''' with '''metallurgy''' in the file '''seddemo.txt'''
+
| and "civil" with "metallurgy" in the file '''seddemo.txt'''.
  
 
|-
 
|-
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|  03:07
 
|  03:07
 
|  Type:
 
|  Type:
−
  '''sed space hyphen '''e''' space within single quotes ‘s front slash electronics slash electrical slash g’ after the single quote space hyphen '''e''' space within single quotes ‘s front slash civil slash metallurgy slash g’''' after the single quotes space '''seddemo.txt'''
+
  '''sed space hyphen e space''' within single quotes '''‘s front slash electronics slash electrical slash g’ after the single quote space hyphen e space''' within single quotes ''' ‘s front-slash civil slash metallurgy slash g’ ''' after the single quotes space '''seddemo.txt'''
  
 
|-
 
|-
 
|  03:37
 
|  03:37
−
| And press '''Enter.'''
+
| Press '''Enter.'''
  
 
|-
 
|-
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|-
 
|-
 
|  03:43
 
|  03:43
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|  Now we want to change the '''stream''' of '''Anirban '''from '''computers''' to '''mathematics.'''
+
|  Now we want to change the '''stream''' of 'Anirban' from "computers" to "mathematics."
  
 
|-
 
|-
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|-
 
|-
 
|  03:54
 
|  03:54
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| '''sed space''' within single quotes ''''front slash Anirban slash s slash computers slash mathematics slash g' ''' after the single quotes space '''seddemo.txt'''
+
| '''sed space''' within single quotes ''' 'front-slash Anirban slash s slash computers slash mathematics slash g' ''' after the single quotes space '''seddemo.txt'''
  
 
|-
 
|-
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|-
 
|-
 
|  04:21
 
|  04:21
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| First we write '''sed''' then in single quotes we write the pattern to be matched.
+
| First we write '''sed''', then in single quotes we write the pattern to be matched.
  
 
|-
 
|-
 
|  04:28
 
|  04:28
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| This is '''Anirban'''.
+
| This is "Anirban".
  
 
|-
 
|-
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|-
 
|-
 
|  04:34
 
|  04:34
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| This is '''s''' that stands for substitution, as we have already seen.
+
| This is 's' that stands for substitution as we have already seen.
  
 
|-
 
|-
 
|  04:41
 
|  04:41
−
| Then we mention the pattern to be replaced which is '''computers'''.
+
| Then we mention the pattern to be replaced which is "computers".
  
 
|-
 
|-
 
|  04:47
 
|  04:47
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| Then the new word that would be substituted, which is '''mathematics'''.
+
| Then the new word that would be substituted which is "mathematics".
  
 
|-
 
|-
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|-
 
|-
 
|  05:00
 
|  05:00
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| Say we want to select those lines which do not have '''stream''' as '''electronics.'''
+
| Say, we want to select those lines which do not have '''stream''' as "electronics."
  
 
|-
 
|-
 
|  05:06
 
|  05:06
−
|  For that, we have the '''d '''flag.
+
|  For that, we have the '''d flag'''.
  
 
|-
 
|-
 
|  05:10
 
|  05:10
 
| Type:
 
| Type:
−
  '''sed space''' within single quotes '''front slash electronics slash d''' after the single quotes '''space seddemo.txt space greater than sign space nonelectronics.txt'''
+
  '''sed space''' within single quotes '''front-slash electronics slash d''' after the single quotes '''space seddemo.txt space greater than sign space nonelectronics.txt'''
  
 
|-
 
|-
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|-
 
|-
 
|  05:33
 
|  05:33
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|  To see the contents, type: '''cat space nonelectronics.txt'''
+
|  To see the contents, type: '''cat space nonelectronics.txt'''.
  
 
|-
 
|-
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|-
 
|-
 
|  05:54
 
|  05:54
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|  We need to type: '''sed space''' in single quotes ''''1i space Student Information' after the quote seddemo.txt '''
+
|  We need to type: '''sed space''' in single quotes''' '1i space Student Information' after the quote space seddemo.txt '''
  
 
|-
 
|-
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|-
 
|-
 
|  06:20
 
|  06:20
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| Say, we want to add the two lines we would do it in a similar way.
+
| Say, we want to add the two lines. We would do it in a similar way.
  
 
|-
 
|-
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|  06:33
 
|  06:33
 
|  So in that case we would write
 
|  So in that case we would write
−
  '''sed space''' in single quotes '''1i space Student Information slash n 2013'''' after the quotes '''seddemo.txt'''  
+
  '''sed space''' in single quotes '''1i space Student Information slash n 2013''' after the quotes '''seddemo.txt'''  
  
 
|-
 
|-
 
|  06:55
 
|  06:55
−
| Press '''Enter'''
+
| Press '''Enter'''.
  
 
|-
 
|-
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|-
 
|-
 
|  07:05
 
|  07:05
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| '''slash n '''prints 2013 in the next line after ‘Student Information’
+
| '''slash n''' prints 2013 in the next line after ‘Student Information’.
  
 
|-
 
|-
 
|  07:12
 
|  07:12
−
|  This brings me to the end of this tutorial.
+
|  This brings us to the end of this tutorial.
  
 
|-
 
|-
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|-
 
|-
 
|  07:17
 
|  07:17
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| In this tutorial we learnt,
+
| In this tutorial we learnt:
  
 
|-
 
|-
 
|  07:19
 
|  07:19
−
| Substitution  
+
|* Substitution  
  
 
|-
 
|-
 
|  07:20
 
|  07:20
−
| Replacement
+
|* Replacement
  
 
|-
 
|-
 
|  07:21
 
|  07:21
−
| And Insertion
+
|* And Insertion.
  
 
|-
 
|-
 
|  07:24
 
|  07:24
−
|  As an assignment, Use the same text file '''seddemo.txt'''
+
|  As an assignment, use the same text file '''seddemo.txt'''
  
 
|-
 
|-
 
|  07:30
 
|  07:30
−
| And try to replace or substitute name '''Ankit''' with '''Ashish'''
+
| and try to replace or substitute name "Ankit" with "Ashish".
  
 
|-
 
|-
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|-
 
|-
 
|  07:39
 
|  07:39
−
| It summarises the Spoken Tutorial project
+
| It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
 
|  07:42
 
|  07:42
−
| 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.
  
 
|-
 
|-
 
|  07:47
 
|  07:47
−
|  The Spoken Tutorial Project Team Conducts workshops using spoken tutorials
+
|  The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials.
  
 
|-
 
|-
 
|  07:53
 
|  07:53
−
| Gives certificates to those who pass an online test
+
| Gives certificates to those who pass an online test.
  
 
|-
 
|-
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|-
 
|-
 
|  08:04
 
|  08:04
−
|  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.
  
 
|-
 
|-
 
|  08:09
 
|  08:09
−
| 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.
  
 
|-
 
|-
 
|  08:16
 
|  08:16
−
| More information on this Mission is available at the link shown below: http://spoken-tutorial.org\NMEICT-Intro
+
| More information on this Mission is available at the link shown below: http://spoken-tutorial.org\NMEICT-Intro.
  
 
|-
 
|-
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|-
 
|-
 
|  08:28
 
|  08:28
−
|This is Ashwini PAtil from IIT bombay signing off.
+
|This is Ashwini PAtil from IIT Bombay, signing off.
  
 
Thank you for joining.
 
Thank you for joining.
  
 
|}
 
|}

Revision as of 15:09, 13 March 2015

Time Narration
00:01 Welcome to the spoken tutorial on More on sed.
00:06 In this tutorial, we will learn some more on sed commands through some examples.
00:13 To record this tutorial, I am using
00:15 *Ubuntu Linux version 12.04 Operating System and
00:20 *GNU BASH version 4.2.24
00:24 Please note, GNU Bash version 4 or above is recommended to practice this tutorial.
00:32 As prerequisites,
00:34 You should know basics of Linux terminal.
00:37 You should be aware of sed tool.
00:40 For relevant tutorials, please visit our website which as shown: http://spoken-tutorial.org
00:46 The major use of sed is substitution.
00:49 Replacing some pattern in the input with something else.
00:55 Let's first look at the original file seddemo.txt.
01:01 Notice that the word "Kumar" occurs two times in the fourth line and once in the sixth line.
01:10 If you want to replace all occurrences of "Kumar" with "Roy",
01:16 type on the terminal:
01:18 sed space within single quote s front slash / opening square bracket small k capital K closing square bracket umar slash Roy slash after the single quotes space seddemo.txt
01:40 Press Enter.
01:43 Notice the fourth line.
01:46 Only the first occurrence of "Kumar" is changed to "Roy", not the second one.
01:52 Sixth line had one occurrence of the word "Kumar" and this is replaced now.
01:57 So, we see only the first entry of the lines has been changed.
02:03 This is because, by default, the first matched entry of any line is substituted.
02:11 To substitute all the matched entries we need to use the flag g option.
02:17 Let me clear the prompt.
02:20 Type: 
sed space (within single quotes) 's front-slash opening square bracket small k capital K closing square bracket umar slash Roy slash g'  after the single quote space seddemo.txt. Press Enter.
02:43 Now, both entries of the fourth line are replaced.
02:48 We can make multiple substitutions in one go as well.
02:53 Say, we want to replace the word "electronics" with the word "electrical"
02:58 and "civil" with "metallurgy" in the file seddemo.txt.
03:04 Let me clear the prompt
03:07 Type: 
sed space hyphen e space within single quotes ‘s front slash electronics slash electrical slash g’ after the single quote space hyphen e space within single quotes  ‘s front-slash civil slash metallurgy slash g’  after the single quotes space seddemo.txt
03:37 Press Enter.
03:39 You can see that the words are replaced.
03:43 Now we want to change the stream of 'Anirban' from "computers" to "mathematics."
03:49 In such case we would need to type:
03:54 sed space within single quotes 'front-slash Anirban slash s slash computers slash mathematics slash g' after the single quotes space seddemo.txt
04:11 Press Enter.
04:14 We see that the stream is changed.
04:17 Let us understand what this is.
04:21 First we write sed, then in single quotes we write the pattern to be matched.
04:28 This is "Anirban".
04:30 Now after the slash comes the operation.
04:34 This is 's' that stands for substitution as we have already seen.
04:41 Then we mention the pattern to be replaced which is "computers".
04:47 Then the new word that would be substituted which is "mathematics".
04:53 We can also use sed to add or delete lines in the file.
05:00 Say, we want to select those lines which do not have stream as "electronics."
05:06 For that, we have the d flag.
05:10 Type: 
sed space within single quotes front-slash electronics slash d after the single quotes space seddemo.txt space greater than sign space nonelectronics.txt
05:31 Press Enter.
05:33 To see the contents, type: cat space nonelectronics.txt.
05:43 Say, at the start of the file we want to add a line Student Information.
05:49 For that we have the i action.
05:54 We need to type: sed space in single quotes '1i space Student Information' after the quote space seddemo.txt
06:10 And press Enter.
06:13 You can see the output.
06:15 In fact, we can enter multiple lines like this.
06:20 Say, we want to add the two lines. We would do it in a similar way.
06:26 Along with Student Information we also want to add academics in the next year.
06:33 So in that case we would write 
sed space in single quotes 1i space Student Information slash n 2013 after the quotes seddemo.txt
06:55 Press Enter.
06:57 Notice slash n between the string ‘Information’ and ‘2013’.
07:05 slash n prints 2013 in the next line after ‘Student Information’.
07:12 This brings us to the end of this tutorial.
07:14 Let us summarize,
07:17 In this tutorial we learnt:
07:19 * Substitution
07:20 * Replacement
07:21 * And Insertion.
07:24 As an assignment, use the same text file seddemo.txt
07:30 and try to replace or substitute name "Ankit" with "Ashish".
07:35 Watch the video available at the link shown below http://spoken-tutorial.org/What_is_a_Spoken Tutorial
07:39 It summarizes the Spoken Tutorial project.
07:42 If you do not have good bandwidth, you can download and watch it.
07:47 The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials.
07:53 Gives certificates to those who pass an online test.
07:57 For more details, please write to contact@spoken-tutorial.org
08:04 Spoken Tutorial Project is a part of the Talk to a Teacher project.
08:09 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
08:16 More information on this Mission is available at the link shown below: http://spoken-tutorial.org\NMEICT-Intro.
08:22 The script has been contributed by Anirban and Sachin.
08:28 This is Ashwini PAtil from IIT Bombay, signing off.

Thank you for joining.

Contributors and Content Editors

Gaurav, PoojaMoolya, Sandhya.np14

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