Linux/C3/More-on-grep-command/English-timed - Revision history

PoojaMoolya at 12:15, 23 March 2017

2017-03-23T12:15:59Z

Madhurig at 09:47, 23 March 2017

2017-03-23T09:47:42Z

PoojaMoolya at 07:04, 10 March 2017

2017-03-10T07:04:18Z

Sandhya.np14 at 04:18, 13 March 2015

2015-03-13T04:18:30Z

Sandhya.np14 at 03:42, 13 March 2015

2015-03-13T03:42:04Z

Sandhya.np14 at 03:39, 13 March 2015

2015-03-13T03:39:07Z

Sandhya.np14 at 03:34, 13 March 2015

2015-03-13T03:34:22Z

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Gaurav: Created page with ' {| border =1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on more on '''grep''' |- | 00:05 | In this tutorial we will learn |- | 00:0…'

2014-07-21T06:49:07Z

Created page with ' {| border =1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on more on '''grep''' |- | 00:05 | In this tutorial we will learn |- | 00:0…'

New page

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

|-
| 00:01
| Welcome to the spoken tutorial on more on '''grep'''

|-
| 00:05
| In this tutorial we will learn

|-
| 00:07
|some more grep commands.

|-
| 00:10
|Through some examples

|-
| 00:13
| To record this tutorial, I am using

|-
| 00:16
|'''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.

|-
| 00:31
| As prerequisites

|-
| 00:33
|You should know Basics of linux terminal.

|-
| 00:36
|You should be aware of grep.

|-
| 00:39
|For relevant tutorials please visit our website which is as shown: http://spoken-tutorial.org

|-
| 00:45
| We can match more than one patterns as well.

|-
| 00:49
|Then we have to use the '''hyphen e''' option.

|-
| 00:53
|I will use the same file grepdemo.txt

|-
| 00:58
|Say we want to find information for those who are either in '''civil''' or '''electronics'''.

|-
| 01:05
|We need to type on the terminal:

|-
| 01:07
|'''grep''' space '''hyphen e''' space within double quotes '''electronics''' after the quotes space '''hyphen e''' space in double quotes '''civil''' after the quotes space '''grepdemo.txt'''

|-
| 01:24
|'''Press Enter.'''

|-
| 01:25
|The output is displayed.

|-
| 01:28
| Say you need to look into people whose title is '''choudhury'''.

|-
| 01:33
|The problem is different peoples spell their titles in different way.

|-
| 01:38
|So what is the solution?.

|-
| 01:42
|In such cases we can use '''hyphen e''' option with '''hyphen i.'''

|-
| 01:48
|Type:
'''grep''' space '''hyphen ie''' space in double quotes '''chaudhury''' after the quotes space '''hyphen ie''' space in double quotes '''chowdhari''' after the quotes space '''grepdemo.txt'''

|-
| 02:12
|'''Press Enter.'''

|-
| 02:14
|The output is displayed.

|-
| 02:16
|But there can be many other ways in which we can write the names.

|-
| 02:23
|How many '''hyphen e''' options can we give.

|-
| 02:26
|Obviously there needs to be a better way and that way is through Regular expressions.

|-
| 02:33
| A regular expression provides a concise and flexible means for matching strings of text.

|-
| 02:41
|Such as particular characters, words or patterns of characters.

|-
| 02:47
| There are a number of regular expression characters.

|-
| 02:52
|Let us see them one by one.

|-
| 02:55
| The character class.

|-
| 02:57
|It allows us to specify a group of characters within a pair of square brackets .

|-
| 03:03
|Only one out of this group of characters is matched.

|-
| 03:08
|Eg. [abc] would mean that this regular expression matches either a or b or c.

|-
| 03:18
| To match '''chaudhury''' we may type at the prompt

|-
| 03:23
|'''grep''' space '''hyphen i''' space within double quotes '''ch opening square bracket ao closing square bracket opening square bracket uw closing square bracket dh opening square bracket ua closing square bracket r opening square bracket yi closing square bracket after the double quotes ''' space '''grepdemo.txt'''

|-
| 03:54
|'''Press Enter.'''

|-
| 03:56
|The output is displayed.

|-
| 03:59
|It still does not match '''choudhuree''' with double e.

|-
| 04:03
| If we want to specify a large range then we write:

|-
| 04:08
|First letter dash last letter of the range

|-
| 04:13
|Suppose we like to match any digit we simply write [0-9].

|-
| 04:20
|One out of this group of characters is matched.

|-
| 04:24
| The Asterisk: The '''asterisk''' refers to 0 or more occurrences of the immediately preceding character.

|-
| 04:33
|For example '''ab asterisk''' can match '''a,ab,abb,abbb''' etc.

|-
| 04:44
| So to match the students name whose name is '''Mira'''

|-
| 04:48
|We type at the prompt:

|-
| 04:51
|'''grep''' space '''hyphen i''' space within double quotes '''m opening square bracket '''ei''' closing square bracket asterisk '''r a a''' '''asterisk''' after the quotes space '''grepdemo.txt'''

|-
| 05:12
|'''Press Enter.'''

|-
| 05:14
|The output is displayed.

|-
| 05:16
| The '''dot''' regular expression matches any one character.

|-
| 05:21
| Say we want to search any words that are 4 letters long and starts with '''M.'''

|-
| 05:29
|We would simply type

|-
| 05:31
|'''grep''' space within double quotes '''M...''' space after the quotes space '''grepdemo.txt'''

|-
| 05:44
|'''Press Enter.'''

|-
| 05:46
|The output is displayed.

|-
| 05:48
|Here the space within the quotes is important as it would match 5 or more letter words.

|-
| 05:56
| We may be specific about where in the line we want to search for our pattern.

|-
| 06:01
|It may be at the beginning of the line.

|-
| 06:04
|For that we have the '''caret sign.'''

|-
| 06:07
| Now if we want get those entries whose roll numbers start with '''A.'''

|-
| 06:14
|We know that roll is the first field in the file.

|-
| 06:19
|We type at the prompt: '''grep ''' within double quotes '''caret sign A''' after the quotes '''grepdemo.txt'''

|-
| 06:29
|'''Press Enter.'''

|-
| 06:32
|The output is displayed.

|-
| 06:35
| Similarly to match a pattern at the end of the file, we have the '''dollar sign.'''

|-
| 06:41
|To find stipends between '''7000 '''to '''8999''' we have to write:

|-
| 06:50
|'''grep''' space within double quotes'''opening square bracket 78 closing square bracket '''...'''dollar sign''' after the quotes space '''grepdemo.txt'''

|-
| 07:06
|'''Press Enter '''

|-
| 07:08
|The output is displayed.

|-
| 07:11
|This brings us to the end of this tutorial.

|-
| 07:13
|Let us summarize.

|-
| 07:16
| In this tutorial we learnt,

|-
| 07:18
|To match more than one pattern

|-
| 07:20
|To check a word that has different spelling

|-
| 07:24
|Character class

|-
| 07:25
|The use of '''asterisk'''

|-
| 07:28
|To match any one character using '''dot'''

|-
| 07:32
|To match a pattern at the beginning of the file

|-
| 07:35
|To match a pattern at the end of the file

|-
| 07:40
| As an assignment,
List those entries that are 5 letters long and starts with Y.

|-
| 07:48
| Watch the video available at the link shown below

|-
| 07:51
|It summarises the Spoken Tutorial project

|-
| 07:54
|If you do not have good bandwidth, you can download and watch it

|-
| 07:59
| The Spoken Tutorial Project Team conducts workshops using spoken tutorials

|-
| 08:05
|Gives certificates to those who pass an online test

|-
| 08:08
|For more details, please write to contact@spoken-tutorial.org

|-
| 08:15
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
| 08:20
|It is supported by the National Mission on Education through ICT, MHRD, Government of India

|-
| 08:26
|More information on this Mission is available at the link shown below : http://spoken-tutorial.org\NMEICT-Intro

|-
| 08:32
| The script has been contributed by Anirban and Sachin.

|-
| 08:36
|This is Ashwini Patil from IIT Bombay signning off. Thank you for joining.

|}

@@ Line 1: / Line 1: @@
 {| border =1
 |  '''Time'''
@@ Line 24: / Line 21: @@
 |-
 | 00:13
-|  To record this tutorial, I am using
+|To record this tutorial, I am using
 |-
@@ Line 383: / Line 380: @@
 |This is Ashwini Patil from IIT Bombay, signning off. Thank you for joining.
 |}

@@ Line 80: / Line 80: @@
 |-
 |  01:24
-|Press '''Enter.'''
+|Press '''Enter.'''The output is displayed.
-−
-|-
-|  01:25
-|The output is displayed.
 |-
@@ Line 317: / Line 313: @@
 |-
 |  07:18
-|* To match more than one pattern
+| To match more than one pattern
 |-
 |  07:20
-|* To check a word that has different spelling
+| To check a word that has different spelling
 |-
 |  07:24
-|* Character class
+|  Character class The use of '''asterisk'''
-−
-|-
-|  07:25
-|* The use of '''asterisk'''
 |-
-|  07:28
+| 07:28
-|* To match any one character using '''dot'''
+| To match any one character using '''dot'''
 |-
 |  07:32
-|* To match a pattern at the beginning of the file
+|  To match a pattern at the beginning of the file
 |-
 |  07:35
-|* To match a pattern at the end of the file.
+|  To match a pattern at the end of the file.
 |-
 |  07:40
-|  As an assignment,
+|  As an assignment,list those entries that are 5 letters long and starts with Y.
- list those entries that are 5 letters long and starts with Y.
 |-

@@ Line 73: / Line 73: @@
 |-
 |  01:07
-|'''grep''' space '''hyphen e''' space within double quotes '''electronics''' after the quotes space '''hyphen e''' space in double quotes '''civil''' after the quotes space '''grepdemo.txt'''
+|'''grep''' space '''hyphen e''' space within double quotes '''electronics''' after the quotes space '''hyphen e''' space in double quotes '''civil''' after the quotes space ''grepdemo.txt'''
 |-
@@ Line 97: / Line 97: @@
 |-
 |  01:48
-|Type:
+|Type: '''grep''' space '''hyphen ie''' space within double quotes '''chaudhury''' after the quotes space '''hyphen ie''' space within double quotes '''chowdhari''' after the quotes space '''grepdemo.txt'''
- '''grep''' space '''hyphen ie''' space within double quotes '''chaudhury''' after the quotes space '''hyphen ie''' space within double quotes '''chowdhari''' after the quotes space '''grepdemo.txt'''
 |-

@@ Line 44: / Line 44: @@
 |-
 |  00:33
-|You should know Basics of Linux terminal.
+|You should know basics of Linux terminal.
 |-
@@ Line 92: / Line 92: @@
 |-
 |  01:33
-|The problem is, different people spell their titles in different way.
+|The problem is, different people spell their titles in different ways.
 |-
@@ Line 105: / Line 105: @@
 |  01:48
 |Type:
-  '''grep''' space '''hyphen ie''' space in double quotes '''chaudhury''' after the quotes space '''hyphen ie''' space in double quotes '''chowdhari''' after the quotes space '''grepdemo.txt'''
+  '''grep''' space '''hyphen ie''' space within double quotes '''chaudhury''' after the quotes space '''hyphen ie''' space within double quotes '''chowdhari''' after the quotes space '''grepdemo.txt'''
 |-
@@ Line 165: / Line 165: @@
 |-
 |  03:23
-|'''grep''' space '''hyphen i''' space within double quotes '''ch opening square bracket ao closing square bracket opening square bracket uw closing square bracket dh opening square bracket ua closing square bracket r opening square bracket yi closing square bracket''' after the double quotes ''' space grepdemo.txt'''
+|'''grep''' space '''hyphen i''' space within double quotes '''ch opening square bracket ao closing square bracket opening square bracket uw closing square bracket dh opening square bracket ua closing square bracket r opening square bracket yi closing square bracket''' after the double quotes '''space grepdemo.txt'''
 |-
@@ Line 213: / Line 213: @@
 |-
 |  04:51
-|'''grep''' space '''hyphen i''' space within double quotes '''m opening square bracket ei closing square bracket asterisk r a a asterisk''' after the quotes space '''grepdemo.txt'''
+|'''grep''' space '''hyphen i''' space within double quotes '''m opening square bracket ei closing square bracket asterisk r a a asterisk''' after the quotes '''space grepdemo.txt'''
 |-
@@ Line 249: / Line 249: @@
 |-
 |  05:48
-|Here, the 'space' within the quotes is important as it would match 5 or more letter words.
+|Here, the '''space''' within the quotes is important as it would match 5 or more letter words.
 |-
@@ Line 273: / Line 273: @@
 |-
 |  06:19
-|We type at the prompt: '''grep ''' within double quotes '''caret''' sign '''A''' after the quotes  '''grepdemo.txt'''
+|We type at the prompt: '''grep '''space within double quotes '''caret''' sign '''A''' after the quotes  '''grepdemo.txt'''
 |-
@@ Line 293: / Line 293: @@
 |-
 |  06:50
-|'''grep''' space within double quotes'''opening square bracket 78 closing square bracket '''...'''dollar sign''' after the quotes space '''grepdemo.txt'''
+|'''grep''' space within double quotes '''opening square bracket 78 closing square bracket''' '''...''' dollar sign after the quotes space '''grepdemo.txt'''
 |-

@@ Line 88: / Line 88: @@
 |-
 |  01:28
-|  Say, you need to look into people whose title is 'choudhury'.
+|  Say, you need to look into people whose title is "choudhury".
 |-
@@ Line 161: / Line 161: @@
 |-
 |  03:18
-|  To match 'chaudhury', we may type at the prompt:
+|  To match "chaudhury", we may type at the prompt:
 |-
@@ Line 177: / Line 177: @@
 |-
 |  03:59
-|It still does not match 'choudhuree' with double 'e'.
+|It still does not match "choudhuree" with double 'e'.
 |-
@@ Line 205: / Line 205: @@
 |-
 |  04:44
-|  So, to match the student's name whose name is '''Mira''',
+|  So, to match the student's name whose name is "Mira",
 |-