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

Pratik kamble at 10:57, 7 March 2017

2017-03-07T10:57:44Z

Pratik kamble at 10:56, 7 March 2017

2017-03-07T10:56:02Z

Sandhya.np14 at 15:42, 13 August 2015

2015-08-13T15:42:05Z

Sandhya.np14 at 05:32, 13 August 2015

2015-08-13T05:32:38Z

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PoojaMoolya at 07:32, 12 February 2015

2015-02-12T07:32:20Z

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PoojaMoolya at 07:32, 12 February 2015

2015-02-12T07:32:03Z

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PoojaMoolya: 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..."

2015-02-12T07:19:32Z

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 on '''grep''' commands.

|-
| 00:10
|Through some examples

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

|-
| 00:16
|'''Linux''' Operating System''' and

|-
| 00:20
|'''GNU BASH''' version 4.2.24

|-
| 00:23
|Please note,''' GNU bash''' version 4 or above is recommended to practice this tutorial.

|-
| 00:29
| As prerequisites

|-
| 00:31
|You should know Basics of linux terminal.

|-
| 00:35
|You should be aware of '''grep.'''

|-
| 00:37
|For relevant tutorials please visit our website which is as shown: http://spoken-tutorial.org

|-
| 00:43
| We can match more than one patterns as well.

|-
| 00:47
|Then we have to use the '''hyphen e''' option.

|-
| 00:52
|I will use the same file '''grepdemo.txt'''

|-
| 00:57
|Say we want to find information for those who are either in '''civil''' or '''electronics'''.

|-
| 01:04
|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 within double quotes '''civil''' after the quotes space '''grepdemo.txt'''

|-
| 01:22
|Press '''Enter.'''

|-
| 01:24
|The output is displayed.

|-
| 01:27
| Say you need to look into people whose title is '''choudhury'''.

|-
| 01:32
|The problem is different peoples spell their titles in different way.

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

|-
| 01:41
|In such cases we can use '''hyphen e''' option with '''hyphen i.'''

|-
| 01:47
|Type: '''grep''' space '''hyphen ie''' space in double quotes '''chaudhury'''('c' 'h' 'a' 'u' 'd' 'h' 'u' 'r' 'y') after the quotes space '''hyphen ie''' space within double quotes '''chowdhari''' ('c' 'h' 'o' 'w' 'd' 'h' 'a' 'r' 'i')after the quotes space '''grepdemo.txt'''

|-
| 02:11
| Press '''Enter.'''

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

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

|-
| 02:22
|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.

|-
| 02:51
|Let us see them one by one.

|-
| 02:54
| The character class.

|-
| 02:56
|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.

|-
| 03:07
|Eg. [abc] would mean that this regular expression matches either a or b or c.

|-
| 03:17
| To match '''chaudhury''' we may type at the prompt

|-
| 03:22
|'''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'''

|-
| 03:53
| Press '''Enter.'''

|-
| 03:55
|The output is displayed.

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

|-
| 04:02
| If we want to specify a large range then we write:

|-
| 04:07
|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.

|-
| 04:43
| So to match the students name whose name is '''Mira'''

|-
| 04:47
|We type at the prompt:

|-
| 04:50
|'''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'''

|-
| 05:11
| Press '''Enter.'''

|-
| 05:13
|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.'''

|-
| 05:27
|We would simply type

|-
| 05:30
|'''grep''' space within double quotes '''M...''' space after the quotes space '''grepdemo.txt'''

|-
| 05:43
|Press '''Enter.'''

|-
| 05:45
|The output is displayed.

|-
| 05:47
|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.'''

|-
| 06:13
|We know that roll is the first field in the file.

|-
| 06:18
|We type at the prompt: '''grep ''' within double quotes '''caret sign A''' after the quotes '''grepdemo.txt'''

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

|-
| 06:31
|The output is displayed.

|-
| 06:34
| Similarly to match a pattern at the end of the file, we have the '''dollar sign.'''

|-
| 06:40
|To find stipends between '''7000 '''to '''8999''' we have to write:

|-
| 06:49
|'''grep''' space within double quotes'''opening square bracket 78 closing square bracket '''...'''dollar sign''' after the quotes space '''grepdemo.txt'''

|-
| 07:05
|Press '''Enter '''

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

|-
| 07:10
|This brings us to the end of this tutorial.

|-
| 07:13
|Let us summarize.

|-
| 07:15
| In this tutorial we learnt,

|-
| 07:17
|To match more than one pattern

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

|-
| 07:23
|Character class

|-
| 07:24
|The use of '''asterisk'''

|-
| 07:27
|To match any one character using '''dot'''

|-
| 07:31
|To match a pattern at the beginning of the file

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

|-
| 07:39
| As an assignment, List those entries that are 5 letters long and starts with Y.

|-
| 07:46
| Watch the video available at the link shown below

|-
| 07:50
|It summarises the Spoken Tutorial project

|-
| 07:53
|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

|-
| 08:04
|Gives certificates to those who pass an online test

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

|-
| 08:14
| Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
| 08:19
|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 321: / Line 321: @@
 |-
 |  07:23
-|* Character class
+|* Character class The use of '''asterisk'''
-−
-|-
-|  07:24
-|* The use of '''asterisk'''
 |-

@@ Line 41: / Line 41: @@
 |-
 |  00:31
-|* you should know basics of '''Linux terminal'''.
+| you should know basics of '''Linux terminal'''.
 |-
 |  00:35
-|* You should be aware of '''grep.'''
+|You should be aware of '''grep.'''
 |-
@@ Line 313: / Line 313: @@
 |-
 |  07:17
-|* 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
 |-
 |  07:23
-|* Character class The use of '''asterisk'''
+| Character class The use of '''asterisk'''
 |-
 |  07:27
-|* To match any one character using '''dot'''
+| To match any one character using '''dot'''
 |-
 |  07:31
-|* 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.
 |-

@@ Line 61: / Line 61: @@
 |-
 |  00:52
-|I will use the same file '''grepdemo.txt'''
+|I will use the same file '''grepdemo.txt'''.
 |-
@@ Line 93: / Line 93: @@
 |-
 |  01:38
-|So, what is the solution?.
+|So, what is the solution?
 |-
@@ Line 101: / Line 101: @@
 |-
 |  01:47
-|Type:  '''grep''' space '''hyphen ie''' space in double quotes '''chaudhury'''('c'  'h'  'a'  'u'  'd'  'h' 'u'  'r'  'y') after the quotes space '''hyphen ie''' space within double quotes '''chowdhari''' ('c' 'h' 'o' 'w' 'd' 'h' 'a' 'r'  'i') after the quotes space '''grepdemo.txt'''.
+|Type:  '''grep''' space '''hyphen ie''' space within double quotes '''chaudhury''' ('c'  'h'  'a'  'u'  'd'  'h' 'u'  'r'  'y') after the quotes space '''hyphen ie''' space within double quotes '''chowdhari''' ('c' 'h' 'o' 'w' 'd' 'h' 'a' 'r'  'i') after the quotes space '''grepdemo.txt'''.
 |-
@@ Line 113: / Line 113: @@
 |-
 |  02:16
-|But there can be many other ways in which we can write the names.
+|But, there can be many other ways in which we can write the names.
 |-
@@ Line 125: / Line 125: @@
 |-
 |  02:33
-|  A regular expression provides a concise and flexible means for matching '''string'''s of text
+|  A 'regular expression' provides a concise and flexible means for matching '''string'''s of text
 |-
@@ Line 145: / Line 145: @@
 |-
 |  02:56
-|It allows us to specify a group of characters within a pair of square brackets .
+|It allows us to specify a group of characters within a pair of square brackets.
 |-
@@ Line 157: / Line 157: @@
 |-
 |  03:17
-|  To match '''chaudhury''', we may type at the prompt
+|  To match '''chaudhury''', we may type at the prompt:
 |-
 |  03:22
-|'''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 185: / Line 185: @@
 |-
 |  04:13
-|Suppose we like to match any digit we simply write [0-9].
+|Suppose we like to match any digit, we simply write [0-9].
 |-
@@ Line 193: / Line 193: @@
 |-
 |  04:24
-|  The asterisk: The '''asterisk''' refers to 0 or more occurrences of the immediately preceding character.
+|  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.
+|For example, '''ab asterisk''' can match '''a,ab,abb,abbb''' etc.
 |-
@@ Line 209: / Line 209: @@
 |-
 |  04:50
-|'''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 245: / Line 245: @@
 |-
 |  05:47
-|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 257: / Line 257: @@
 |-
 |  06:04
-|For that, we have the '''caret sign.'''
+|For that, we have the '''caret''' sign.
 |-
@@ Line 269: / Line 269: @@
 |-
 |  06:18
-|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 281: / Line 281: @@
 |-
 |  06:34
-|  Similarly, to match a pattern at the end of the file, we have the '''dollar sign.'''
+|  Similarly, to match a pattern at the end of the file, we have the '''dollar''' sign.
 |-
@@ Line 289: / Line 289: @@
 |-
 |  06:49
-|'''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'''
 |-
 |  07:05
-|Press '''Enter '''
+|Press '''Enter '''.
 |-
@@ Line 309: / Line 309: @@
 |-
 |  07:15
-| In this tutorial we learnt:
+| In this tutorial, we learnt:
 |-
@@ Line 341: / Line 341: @@
 |-
 |  07:39
-|  As an assignment, list those entries that are 5 letters long and starts with Y.
+|  As an assignment, list those entries that are 5 letters long and starts with 'Y'.
 |-