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

Pratik kamble at 10:52, 7 March 2017

2017-03-07T10:52:12Z

Sandhya.np14 at 16:58, 13 August 2015

2015-08-13T16:58:51Z

Sandhya.np14 at 16:52, 13 August 2015

2015-08-13T16:52:34Z

Sandhya.np14 at 05:05, 13 August 2015

2015-08-13T05:05:16Z

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PoojaMoolya at 07:30, 12 February 2015

2015-02-12T07:30:29Z

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PoojaMoolya at 07:30, 12 February 2015

2015-02-12T07:30:09Z

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

2015-02-12T07:15:59Z

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

New page

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

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

|-
|00:05
|In this tutorial we will learn '''grep command'''.

|-
|00:09
|We will do this with the help of some examples.

|-
|00:12
|To record this tutorial, I am using

|-
|00:15
|*''' Linux''' ''' Operating System'''

|-
|00:18
| and *'''GNU BASH''' version 4.2.24

|-
|00:22
|Please note,''' GNU bash''' version 4 or above is recommended to practise this tutorial.

|-
|00:30
|As prerequisites You should know basics of '''Linux terminal'''

|-
|00:34
|For relevant tutorials, please visit our website which is as shown.

|-
|00:39
|First let us know about regular expressions.

|-
|00:43
|*Regular expressions are pattern matching techniques.

|-
|00:47
|*When we have to find out whether a pattern exist in a line, paragraph or a file.

|-
|00:54
|For ex. If you want to search a phone number in the telephone directory

|-
| 01:01
| Or To find a keyword in a paragraph or a line, we use '''grep command'''
Let us move on to '''grep'''.

|-
|01:08
|'''grep''' searches for one or more patterns in one or more line, paragraph or a file.

|-
|01:15
|If filename is not mentioned,''' grep''' search for the patterns in the standard input.

|-
|01:22
|If filename is missing, '''grep''' searches for the patterns in the standard input.

|-
|01:28
|I will demonstrate usage of '''grep''' using a demo file called '''grepdemo.txt'''

|-
|01:35
|Let us see the content of the file.

|-
|01:37
|This is a file that has 13 entries.

|-
|01:41
|Each entry has 6 fields roll number, name, stream, marks, and stipend amount.

|-
|01:50
|The fields are separated by a bar, which is called a '''delimiter'''.

|-
|01:55
|Let us see how '''grep''' works.

|-
|01:58
|Say we want to use '''grep command''', to see who are the students in the '''computers''' stream.

|-
|02:04
|For this we have to open the '''terminal'''.

|-
|02:07
|Now type on the '''terminal''':

|-
|02:09
|'''grep space (within double quotes) computers after the double quotes space grepdemo .txt'''

|-
|02:18
|Press Enter

|-
|02:20
|This would enlist those entries where stream is '''computers'''.

|-
|02:25
|Now compare the result with the original file.

|-
|02:29
|Come back to our text editor.

|-
|02:31
|We see that the entry for ''' Zubin''' is not enlisted.

|-
|02:37
|Why this is so?

|-
|02:38
|This is because '''grep''' searched for the pattern '''“computers”''' with small '''c'''

|-
|02:43
|While for '''Zubin''', the stream is “Computers” with a capital '''C'''.

|-
|02:48
|The pattern matching is '''case sensitive'''.

|-
|02:51
|To make it '''case''' insensitive, we need to use the '''minus i ''' option with '''grep'''.

|-
|02:58
|Come back to our terminal Now Type:
'''grep space (minus) i space (within double quotes) “'''computers”''' after the '''double quotes space grepdemo.txt'''

|-
|03:12
|Press ''' Enter.'''

|-
|03:13
|This will now enlist all the four entries.

|-
|03:17
|So we saw, '''grep''' enlists only those lines of files that match a given pattern.

|-
|03:23
|We may do the reverse.

|-
|03:26
|It is possible to make '''grep''' enlist only those lines that '''do not''' match the pattern.

|-
|03:32
|For that we have the '''minus v''' option.

|-
|03:35
|Say, we want to enlist those entries of students who have not passed.

|-
|03:40
|We can also store this result in another file

|-
|03:43
|For this type:
'''grep space minus iv space''' Within double quotes '''pass after the double quotes space grepdemo.txt space greater than sign space notpass.txt '''

|-
|04:02
|Press '''Enter.'''

|-
|04:04
|To see the content of file, type: '''cat space notpass.txt '''

|-
|04:11
|Press '''Enter'''.

|-
|04:12
|The output is displayed.

|-
|04:15
|Now at the '''prompt''' type:

|-
|04:17
|''grep space minus i space''' within double quotes '''fail''' after the double quotes space '''grepdemo.txt'''

|-
|04:28
|And Press '''Enter.'''

|-
|04:30
|This is different.

|-
|04:32
|This will include those students who are failed but their result is incomplete.

|-
|04:37
|If we want to see the line number in the file at which the enlisted entries are, we have the '''minus n''' option

|-
|04:46
|Let us clear the '''prompt'''.

|-
|04:49
| Now type "'''grep space -in space within double quote "fail" after the double quotes space grepdemo.txt'''

|-
|05:01
|Press '''Enter'''.

|-
|05:03
|The line number is displayed.

|-
|05:06
|The patterns so far have been of single word.

|-
|05:10
|We may have multiword patterns as well.

|-
|05:13
|But the entire pattern must be within '''quotes'''.

|-
|05:17
|So type: '''grep space minus i space'''within double quotes '''ankit space saraf after the double quotes space grepdemo.txt '''

|-
|05:29
|Press '''Enter'''.

|-
|05:31
|We see that '''Ankit Saraf''''s record is displayed.

|-
|05:35
|We can also find patterns in multiple files.

|-
|05:39
|For this Type:
'''grep space minus i space''' within double quotes '''fail after double quotes space grepdemo.txt space notpass.txt'''

|-
|05:55
|'''Press Enter'''.

|-
|05:57
|The output is displayed.

|-
|05:59
|With multiple files, '''grep''' will write the name of the file in which the entry was found.'''grepdemo.txt''' and '''notpass.txt'''

|-
|06:10
|These are the records from '''notpass.txt''' file and these are the records from '''grepdemo.txt''' file.

|-
|06:18
|Suppose we may only want to know the '''number of matches '''or '''count''' .

|-
|06:23
|For that, we have the '''minus c''' option

|-
|06:27
| So Type: '''grep space minus c space'''within double quotes '''Fail with a capital F after the quotes space grepdemo.txt'''

|-
|06:40
|Press '''Enter'''.

|-
|06:42
|This will give us the '''count''' of number of lines matched.

|-
|06:46
|This brings us to the end of this tutorial.

|-
|06:51
|Let us summarize.

|-
| 06:53
| In this tutorial we learnt,

|-
|06:55
|*To see the content of a file
**eg. '''cat filename'''
|-
|06:59
|*To list the entries of a particular stream
**eg. '''grep “computers” grepdemo.txt'''

|-
|07:06
|*To ignore cases
**eg. '''grep -i “computers” grepdemo.txt'''

|-
|07:14
|*Lines that do not match the pattern
**eg. '''grep -iv “pass” grepdemo.txt'''

|-
|07:22
|*To list the line numbers with the entries
**eg.''' grep -in “fail” grepdemo.txt'''

|-
|07:31
|*To store the result in another file
**eg. '''grep -iv “pass” grepdemo.txt > notpass.txt'''

|-
|07:41
|And*To know the count
**eg.''' grep -c “Fail” grepdemo.txt'''

|-
|07:48
|As an assignment,

|-
|07:50
|Explore some other commands like '''-E, + and ?'''

|-
|07:56
|Watch the video available at the link shown below.

|-
|07:58
|It summarises the Spoken Tutorial project.

|-
|08:01
|If you do not have good bandwidth, you can download and watch it.

|-
|08:05
|The Spoken Tutorial Project Team

|-
|08:07
|*Conducts workshops using spoken tutorials

|-
|08:11
|*Gives certificates to those who pass an online test

|-
|08:14
|For more details, please write to
'''contact@spoken-tutorial.org'''

|-
|08:21
|Spoken Tutorial Project is a part of the Talk to a Teacher project

|-
|08:25
|It is supported by the National Mission on Education through ICT, MHRD, Government of India

|-
|08:32
|More information on this Mission is available at: http://spoken-tutorial.org\NMEICT-Intro

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

|}

@@ Line 21: / Line 21: @@
 |-
 |00:15
-|* '''Linux''' ''' Operating System''' and
+|'''Linux''' ''' Operating System''' and
 |-
 |00:18
-|* '''GNU BASH''' version 4.2.24
+|'''GNU BASH''' version 4.2.24
 |-
@@ Line 159: / Line 159: @@
 |-
 |03:12
-|Press ''' Enter.'''
+|Press ''' Enter.'''This will now enlist all the four entries.
-−
-|-
-|03:13
-|This will now enlist all the four entries.
 |-
@@ Line 204: / Line 200: @@
 |-
 |04:11
-|Press '''Enter'''.
+|Press '''Enter'''.The output is displayed.
-−
-|-
-|04:12
-|The output is displayed.
 |-
@@ Line 333: / Line 325: @@
 |-
 |06:55
-|* To see the content of a file
+|To see the content of a file e.g. '''cat filename'''
-* e.g. '''cat filename'''
 |-
 |06:59
-|* To list the entries of a particular stream
+| To list the entries of a particular stream e.g. '''grep “computers” grepdemo.txt'''
-* e.g. '''grep “computers” grepdemo.txt'''
 |-
 |07:06
-|* To ignore cases
+|To ignore cases e.g. '''grep -i “computers” grepdemo.txt'''
-* e.g. '''grep -i “computers” grepdemo.txt'''
 |-
 |07:14
-|* Lines that do not match the pattern
+|Lines that do not match the pattern e.g. '''grep -iv “pass” grepdemo.txt'''
-* e.g. '''grep -iv “pass” grepdemo.txt'''
 |-
 |07:22
-|* To list the line numbers with the entries
+|To list the line numbers with the entries e.g.''' grep -in “fail” grepdemo.txt'''
-* e.g.''' grep -in “fail” grepdemo.txt'''
 |-
 |07:31
-|* To store the result in another file
+|To store the result in another file e.g. '''grep -iv “pass” grepdemo.txt  notpass.txt''' and
-* e.g. '''grep -iv “pass” grepdemo.txt > notpass.txt''' and
 |-
 |07:41
-|* To know the count
+|To know the count e.g.''' grep -c “Fail” grepdemo.txt'''.
-* e.g.''' grep -c “Fail” grepdemo.txt'''.
 |-
@@ Line 391: / Line 376: @@
 |-
 |08:07
-|* Conducts workshops using spoken tutorials.
+|Conducts workshops using spoken tutorials.
 |-
 |08:11
-|* Gives certificates to those who pass an online test.
+| Gives certificates to those who pass an online test.
 |-
 |08:14
-|For more details, please write to
+|For more details, please write to'''contact@spoken-tutorial.org'''
 '''contact@spoken-tutorial.org'''
 |-

@@ Line 216: / Line 216: @@
 |-
 |04:17
-|''grep space minus i space''' within double quotes '''fail''' after the double quotes space '''grepdemo.txt'''
+|'''grep space minus i space''' within double quotes '''fail''' after the double quotes space '''grepdemo.txt'''
 |-
@@ Line 334: / Line 334: @@
 |06:55
 |* To see the content of a file
-** e.g. '''cat filename'''
+* e.g. '''cat filename'''
 |-
 |06:59
 |* To list the entries of a particular stream
-** e.g. '''grep “computers” grepdemo.txt'''
+* e.g. '''grep “computers” grepdemo.txt'''
 |-
 |07:06
 |* To ignore cases
-** e.g. '''grep -i “computers” grepdemo.txt'''
+* e.g. '''grep -i “computers” grepdemo.txt'''
 |-
 |07:14
 |* Lines that do not match the pattern
-** e.g. '''grep -iv “pass” grepdemo.txt'''
+* e.g. '''grep -iv “pass” grepdemo.txt'''
 |-
 |07:22
 |* To list the line numbers with the entries
-** e.g.''' grep -in “fail” grepdemo.txt'''
+* e.g.''' grep -in “fail” grepdemo.txt'''
 |-
 |07:31
 |* To store the result in another file
-** e.g. '''grep -iv “pass” grepdemo.txt > notpass.txt''' and
+* e.g. '''grep -iv “pass” grepdemo.txt > notpass.txt''' and
 |-
 |07:41
 |* To know the count
-** e.g.''' grep -c “Fail” grepdemo.txt'''.
+* e.g.''' grep -c “Fail” grepdemo.txt'''.
 |-

@@ Line 62: / Line 62: @@
 |-
 |01:08
-|'''grep''' searches for one or more patterns in one or more line, paragraph or a file.
+|'''grep''' searches for one or more patterns in one or more lines, paragraph or a file.
 |-
@@ Line 86: / Line 86: @@
 |-
 |01:41
-|Each entry has 6 fields roll number, name, stream, marks, and stipend amount.
+|Each entry has 6 '''field'''s- '''roll number, name, stream, marks''' and '''stipend amount'''.
 |-
 |01:50
-|The fields are separated by a bar, which is called a '''delimiter'''.
+|The fields are separated by a bar which is called a '''delimiter'''.
 |-
@@ Line 98: / Line 98: @@
 |-
 |01:58
-|Say, we want to use '''grep command''' to see who are the students in the '''computers''' stream.
+|Say, we want to use ''''grep' command''' to see who are the students in the '''computers''' stream.
 |-
 |02:04
-|For this we have to open the '''terminal'''.
+|For this, we have to open the '''terminal'''.
 |-
 |02:07
-|Now type on the '''terminal''':
+|Now, type on the terminal:
 |-
@@ Line 126: / Line 126: @@
 |-
 |02:29
-|Come back to our text editor.
+|Come back to our '''text editor'''.
 |-
@@ Line 138: / Line 138: @@
 |-
 |02:38
-|This is because '''grep''' searched for the pattern '''“computers”''' with small '''c'''
+|This is because '''grep''' searched for the pattern “computers” with small '''c'''
 |-
@@ Line 155: / Line 155: @@
 |02:58
 |Come back to our terminal. Now, type:
-'''grep space (minus) i  space (within double quotes) “'''computers”''' after the '''double quotes space grepdemo.txt'''
+'''grep space minus i  space within double quotes computers after the double quotes space grepdemo.txt'''
 |-
@@ Line 175: / Line 175: @@
 |-
 |03:26
-|It is possible to make '''grep''' enlist only those lines that '''do not''' match the pattern.
+|It is possible to make '''grep''' enlist only those lines that do not match the pattern.
 |-
 |03:32
-|For that we have the '''minus v''' option.
+|For that, we have the '''minus v''' option.
 |-
@@ Line 220: / Line 220: @@
 |-
 |04:28
-|And Press '''Enter.'''
+|and press '''Enter.'''
 |-
@@ Line 240: / Line 240: @@
 |-
 |04:49
-|  Now, type: "'''grep space -in space within double quote "fail" after the double quotes space grepdemo.txt'''
+|  Now, type: '''grep space -in space within double quote "fail" after the double quotes space grepdemo.txt'''
 |-
@@ Line 264: / Line 264: @@
 |-
 |05:17
-|So, type: '''grep space minus i space'''within double quotes '''ankit space saraf after the double quotes space grepdemo.txt '''
+|So, type: '''grep space minus i space''' within double quotes '''ankit space saraf after the double quotes space grepdemo.txt'''
 |-
@@ Line 301: / Line 301: @@
 |-
 |06:18
-|Suppose we may only want to know the '''number of matches '''or '''count''' .
+|Suppose, we may only want to know the number of matches or '''count''' .
 |-
@@ Line 309: / Line 309: @@
 |-
 |06:27
-| So, type: '''grep space minus c space'''within double quotes '''Fail'''  with a capital F after the quotes '''space grepdemo.txt'''
+| So, type: '''grep space minus c space''' within double quotes '''Fail'''  with a capital F after the quotes '''space grepdemo.txt'''
 |-
@@ Line 334: / Line 334: @@
 |06:55
 |* To see the content of a file
-**eg. '''cat filename'''
+** e.g. '''cat filename'''
 |-
 |06:59
 |* To list the entries of a particular stream
-**eg. '''grep “computers” grepdemo.txt'''
+** e.g. '''grep “computers” grepdemo.txt'''
 |-
 |07:06
 |* To ignore cases
-**eg. '''grep -i “computers” grepdemo.txt'''
+** e.g. '''grep -i “computers” grepdemo.txt'''
 |-
 |07:14
 |* Lines that do not match the pattern
-**eg. '''grep -iv “pass” grepdemo.txt'''
+** e.g. '''grep -iv “pass” grepdemo.txt'''
 |-
 |07:22
 |* To list the line numbers with the entries
-**eg.''' grep -in “fail” grepdemo.txt'''
+** e.g.''' grep -in “fail” grepdemo.txt'''
 |-
 |07:31
 |* To store the result in another file
-**eg. '''grep -iv “pass” grepdemo.txt > notpass.txt''' and
+** e.g. '''grep -iv “pass” grepdemo.txt > notpass.txt''' and
 |-
 |07:41
 |* To know the count
-**eg.''' grep -c “Fail” grepdemo.txt'''.
+** e.g.''' grep -c “Fail” grepdemo.txt'''.
 |-
@@ Line 371: / Line 371: @@
 |-
 |07:50
-|explore some other commands like '''-E, + and ?'''
+|explore some other commands like '''-E, + and ?'''.
 |-
@@ Line 391: / Line 391: @@
 |-
 |08:07
-|* Conducts workshops using spoken tutorials
+|* Conducts workshops using spoken tutorials.
 |-