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

From Script | Spoken-Tutorial
Jump to: navigation, search
(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…')
 
Line 8: Line 8:
 
|-
 
|-
 
|  00:01
 
|  00:01
−
|  Welcome to the spoken tutorial on more on '''grep'''  
+
|  Welcome to the spoken tutorial on '''More on grep'''.
  
 
|-
 
|-
Line 16: Line 16:
 
|-
 
|-
 
|  00:07
 
|  00:07
−
|some more grep commands.
+
|some more '''grep commands'''
  
 
|-
 
|-
 
|  00:10
 
|  00:10
−
|Through some examples
+
|through some examples.
  
 
|-
 
|-
Line 40: Line 40:
 
|-
 
|-
 
|  00:31
 
|  00:31
−
|  As prerequisites
+
|  As prerequisites:
  
 
|-
 
|-
 
|  00:33
 
|  00:33
−
|You should know Basics of linux terminal.
+
|You should know Basics of Linux terminal.
  
 
|-
 
|-
 
|  00:36
 
|  00:36
−
|You should be aware of grep.
+
|You should be aware of 'grep'.
  
 
|-
 
|-
 
|  00:39
 
|  00:39
−
|For relevant tutorials please visit our website which is as shown: http://spoken-tutorial.org
+
|For relevant tutorials, please visit our website which is as shown: http://spoken-tutorial.org
  
 
|-
 
|-
Line 64: Line 64:
 
|-
 
|-
 
|  00:53
 
|  00:53
−
|I will use the same file grepdemo.txt
+
|I will use the same file 'grepdemo.txt'.
  
 
|-
 
|-
 
|  00:58
 
|  00:58
−
|Say we want to find information for those who are either in '''civil''' or '''electronics'''.
+
|Say, we want to find information for those who are either in '''civil''' or '''electronics'''.
  
 
|-
 
|-
Line 80: Line 80:
 
|-
 
|-
 
|  01:24
 
|  01:24
−
|'''Press Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
Line 88: Line 88:
 
|-
 
|-
 
|  01:28
 
|  01:28
−
|  Say you need to look into people whose title is '''choudhury'''.
+
|  Say, you need to look into people whose title is '''choudhury'''.
  
 
|-
 
|-
 
|  01:33
 
|  01:33
−
|The problem is different peoples spell their titles in different way.
+
|The problem is, different people spell their titles in different way.
  
 
|-
 
|-
Line 109: Line 109:
 
|-
 
|-
 
|  02:12
 
|  02:12
−
|'''Press Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
Line 121: Line 121:
 
|-
 
|-
 
|  02:23
 
|  02:23
−
|How many '''hyphen e''' options can we give.
+
|How many '''hyphen e''' options can we give?
  
 
|-
 
|-
 
|  02:26
 
|  02:26
−
|Obviously there needs to be a better way and that way is through Regular expressions.
+
|Obviously there needs to be a better way and that way is through ''Regular expressions''.
  
 
|-
 
|-
 
|  02:33
 
|  02:33
−
|  A regular expression provides a concise and flexible means for matching strings of text.
+
|  A ''regular expression'' provides a concise and flexible means for matching strings of text
  
 
|-
 
|-
 
|  02:41
 
|  02:41
−
|Such as particular characters, words or patterns of characters.
+
|such as particular characters, words or patterns of characters.
  
 
|-
 
|-
Line 145: Line 145:
 
|-
 
|-
 
|  02:55
 
|  02:55
−
|  The character class.
+
|  The character class:
  
 
|-
 
|-
Line 165: Line 165:
 
|-
 
|-
 
|  03:23
 
|  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'''
  
 
|-
 
|-
 
|  03:54
 
|  03:54
−
|'''Press Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
Line 177: Line 177:
 
|-
 
|-
 
|  03:59
 
|  03:59
−
|It still does not match '''choudhuree''' with double e.
+
|It still does not match 'choudhuree' with double 'e'.
  
 
|-
 
|-
Line 201: Line 201:
 
|-
 
|-
 
|  04:33
 
|  04:33
−
|For example '''ab asterisk''' can match '''a,ab,abb,abbb''' etc.
+
|For example '''ab asterisk''' can match '''a, ab, abb, abbb''' etc.
  
 
|-
 
|-
 
|  04:44
 
|  04:44
−
|  So to match the students name whose name is '''Mira'''
+
|  So, to match the student's name whose name is '''Mira''',
  
 
|-
 
|-
 
|  04:48
 
|  04:48
−
|We type at the prompt:
+
|we type at the prompt:
  
 
|-
 
|-
 
|  04:51
 
|  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'''
  
 
|-
 
|-
 
|  05:12
 
|  05:12
−
|'''Press Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
Line 229: Line 229:
 
|-
 
|-
 
|  05:21
 
|  05:21
−
|  Say we want to search any words that are 4 letters long and starts with '''M.'''
+
|  Say, we want to search any words that are 4 letters long and starts with '''M.'''
  
 
|-
 
|-
 
|  05:29
 
|  05:29
−
|We would simply type
+
|We would simply type:
  
 
|-
 
|-
Line 241: Line 241:
 
|-
 
|-
 
|  05:44
 
|  05:44
−
|'''Press Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
Line 249: Line 249:
 
|-
 
|-
 
|  05:48
 
|  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 261: Line 261:
 
|-
 
|-
 
|  06:04
 
|  06:04
−
|For that we have the '''caret sign.'''
+
|For that we have the '''caret''' sign.
  
 
|-
 
|-
 
|  06:07
 
|  06:07
−
|  Now if we want get those entries whose roll numbers start with '''A.'''
+
|  Now if we want to get those entries whose roll numbers start with '''A.'''
  
 
|-
 
|-
Line 273: Line 273:
 
|-
 
|-
 
|  06:19
 
|  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 ''' within double quotes '''caret''' sign '''A''' after the quotes  '''grepdemo.txt'''
  
 
|-
 
|-
 
|  06:29
 
|  06:29
−
|'''Press Enter.'''
+
|Press '''Enter.'''
  
 
|-
 
|-
Line 285: Line 285:
 
|-
 
|-
 
|  06:35
 
|  06:35
−
|  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 297: Line 297:
 
|-
 
|-
 
|  07:06
 
|  07:06
−
|'''Press Enter '''
+
|Press '''Enter '''.
  
 
|-
 
|-
Line 313: Line 313:
 
|-
 
|-
 
|  07:16
 
|  07:16
−
|  In this tutorial we learnt,
+
|  In this tutorial we learnt:
  
 
|-
 
|-
 
|  07:18
 
|  07:18
−
|To match more than one pattern
+
|* To match more than one pattern
 
   
 
   
 
|-
 
|-
 
|  07:20
 
|  07:20
−
|To check a word that has different spelling
+
|* To check a word that has different spelling
  
 
|-
 
|-
 
|  07:24
 
|  07:24
−
|Character class
+
|* Character class
  
 
|-
 
|-
 
|  07:25
 
|  07:25
−
|The use of '''asterisk'''
+
|* The use of '''asterisk'''
  
 
|-
 
|-
 
|  07:28
 
|  07:28
−
|To match any one character using '''dot'''
+
|* To match any one character using '''dot'''
  
 
|-
 
|-
 
|  07:32
 
|  07:32
−
|To match a pattern at the beginning of the file
+
|* To match a pattern at the beginning of the file
  
 
|-
 
|-
 
|  07:35
 
|  07:35
−
|To match a pattern at the end of the file
+
|* To match a pattern at the end of the file.
  
 
|-
 
|-
 
|  07:40
 
|  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.
  
 
|-
 
|-
 
|  07:48
 
|  07:48
−
|  Watch the video available at the link shown below
+
|  Watch the video available at the link shown below.
  
 
|-
 
|-
 
|  07:51
 
|  07:51
−
|It summarises the Spoken Tutorial project
+
|It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
 
|  07:54
 
|  07:54
−
|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.
  
 
|-
 
|-
 
|  07:59
 
|  07:59
−
|  The Spoken Tutorial Project Team conducts workshops using spoken tutorials
+
|  The Spoken Tutorial Project Team conducts workshops using spoken tutorials,
  
 
|-
 
|-
 
|  08:05
 
|  08:05
−
|Gives certificates to those who pass an online test
+
|gives certificates to those who pass an online test.
  
 
|-
 
|-
Line 374: Line 374:
 
|-
 
|-
 
|  08:15
 
|  08:15
−
|  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.
  
 
|-
 
|-
 
|  08:20
 
|  08:20
−
|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.
  
 
|-
 
|-
Line 390: Line 390:
 
|-
 
|-
 
|  08:36
 
|  08:36
−
|This is Ashwini Patil from IIT Bombay signning off. Thank you for joining.
+
|This is Ashwini Patil from IIT Bombay, signning off. Thank you for joining.
  
 
|}
 
|}

Revision as of 09:04, 13 March 2015


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 people 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 student's 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 to 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 quotesopening 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 summarizes 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.

Contributors and Content Editors

Gaurav, Madhurig, PoojaMoolya, Sandhya.np14

Retrieved from "https://script.spoken-tutorial.org/index.php?title=Linux/C3/More-on-grep-command/English-timed&oldid=20822"