Linux-New/C3/Introduction-to-grep-command/English - Revision history

Madhurig: Madhurig moved page Linux-Ubuntu/C3/Introduction-to-grep-command/English to Linux-New/C3/Introduction-to-grep-command/English

2026-03-24T11:11:29Z

Madhurig moved page Linux-Ubuntu/C3/Introduction-to-grep-command/English to Linux-New/C3/Introduction-to-grep-command/English

Madhurig at 12:15, 11 March 2026

2026-03-11T12:15:59Z

Madhurig at 12:12, 11 March 2026

2026-03-11T12:12:40Z

Madhurig at 12:06, 25 January 2026

2026-01-25T12:06:00Z

Madhurig at 12:04, 25 January 2026

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Madhurig at 11:36, 25 January 2026

2026-01-25T11:36:03Z

Ketkinaina: Created page with "'''Title of the Script: Introduction to grep command. '''Author:''' EduPyramids.''' '''Keywords:''' '''grep, pattern matching, case-insensitive, inverse match, multiword sea..."

2026-01-25T09:13:40Z

Created page with "'''Title of the Script: Introduction to grep command. '''Author:''' EduPyramids.''' '''Keywords:''' '''grep, pattern matching, case-insensitive, inverse match, multiword sea..."

New page

'''Title of the Script: Introduction to grep command.

'''Author:''' EduPyramids.'''

'''Keywords:''' '''grep, pattern matching, case-insensitive, inverse match, multiword search, line numbers, count matches, edupyramids, video tutorial.'''

{|border=1
|-
|| '''Visual Cue'''
|| '''Narration'''
|-
|| '''Slide 1'''

'''Title Slide'''
|| Welcome to this spoken tutorial on '''Introduction to grep command'''.
|-
|| '''Slide 2 Learning Objectives  '''

|| In this tutorial, we will learn to:* View the content of a file
* List entries of a particular stream
* Ignore cases while searching
* Handle lines that do not match a pattern
* Display line numbers with the entries
* Store the result in another file
* Count the number of matches

|-
|| '''Slide 3'''

'''System  Requirements'''

|| To record this tutorial, I am using 

'''Ubuntu OS '''version 24 point zero 4
|-
|| '''Slide 4Pre-requisites'''

'''https://EduPyramids.org'''

|| To follow this tutorial,

Learners should have '''Ubuntu version 24 point zero 4'''.

And should be familiar with basic Linux terminal commands.

For the prerequisite of Linux tutorials please visit this website.
|-
|| '''Slide 5'''

'''Code Files'''

The following code files are required to practice this tutorial.# '''grepdemo.txt'''
# '''igc-commands.txt'''

These files are provided in the Code Files link of this tutorial page.
|| The following code files are required to practice this tutorial.

These files are provided in the Code Files link of this tutorial page.
|-
| |
|| First let us learn about regular expressions.
|-
|| '''Slide 6'''

'''Regular Expressions'''
|| * Regular expressions are patterns used to match text.
* They help to search and filter information in files.
* They can match words, numbers, or character sequences.
* In Linux, commands like '''grep''' use regular expressions.

|-
|| '''Slide 7'''

'''grep command '''
|| * '''grep''' is a '''Linux''' command used to search text.
* It finds lines that match a given pattern.
* It works on files or standard input.
* It supports regular expressions for searching.

|-
|| Download code file.Cut and paste to Home directory.open '''grepdemo.txt '''code file.
|| We will now demonstrate the '''grep''' command using the '''grepdemo.txt file'''.

Download this file and move it to your home directory.
|-
|| show the entries and point to the separation bar (|)
|| This file contains 13 entries.Each entry has a roll number, name, stream, marks, result, and stipend.

The fields are separated by a vertical bar, which acts as a '''delimiter'''.
|-
|| '''Note: Please type the commands on the terminal don't paste as the double quotes are wrong.'''
|| Let us see how grep works.

Let’s find students from the computer’s stream.
|-
|| Type

'''grep "computers" grepdemo.txt '''press enterShow side by side '''grepdemo.txt '''file entries.
|| At the terminal type, '''grep space double quote computers double quote space grepdemo dot t x t '''and press '''Enter'''. The output shows entries from the computer’s stream.

Let us compare it with the original file.
|-
|| Highlight Zubin entry in the file
|| Notice that the entry for Zubin is missing. This happens because '''grep''' is case sensitive.
|-
|| Point to the capital C
|| Why is this entry missing?

'''grep''' searched for computers in lowercase.

Zubin’s stream is written as Computers with a capital '''C'''.
|-
|| Type '''grep -i "computers" grepdemo.txt '''Highlight '''-i'''press '''Enter'''
|| Pattern matching is case sensitive by default.To make it case insensitive, we need to use the '''hyphen i '''option with '''grep'''.

Type this command and press '''Enter'''.
|-
|| Point to the output.
|| Now, all four matching entries are displayed.

Observe that,''' grep''' lists only the lines that match a given pattern.

We can also do the reverse.
|-
|| Type '''grep -iv "pass" grepdemo.txt '''Highlight '''-v'''press '''Enter'''

Point to the output.
|| Type this command. The '''hyphen v '''option lists the lines that do not match a pattern. Press '''Enter '''to see the output.

Output shows students who failed or have incomplete results.
|-
|| Show side by side home folder.Type '''grep -iv "pass" grepdemo.txt > notpass.txt''' press '''Enter'''.
|| Let us store the output in a file named '''not pass dot t x t'''.

Type this command and press''' Enter'''.The file is created successfully.
|-
|| Type '''cat notpass.txt '''press '''Enter'''.
|| To view the students who have not passed, type '''cat space not pass dot t x t '''and press '''Enter'''.Observe the output.
|-
|| Type '''grep -i "fail" grepdemo.txt '''

Highlight''' '''output
|| Type this command to list the failed students and press '''Enter'''.The output shows all students who have failed.
|-
|| type

'''grep -in "fail" grepdemo.txt '''

press enter
|| Let us use the '''hyphen n '''option to show line numbers with matching entries.

Type this command and press '''Enter'''.

Observe the output.
|-
|| Type '''clear '''press''' Enter'''.
|| Let us clear the terminal screen.
|-
| |
|| So far, we used single-word patterns. For multi-word patterns, we have to put the entire pattern in quotes.
|-
|| type

'''grep -i "ankit saraf" grepdemo.txt '''press enter
|| Type this command and press '''Enter'''.

We can see that '''Ankit Saraf''''s record is displayed.
|-
|| At the prompt type

'''grep -i "fail" grepdemo.txt notpass.txt'''

press''' Enter'''.
|| We can also find patterns in multiple files.Type this command and press''' Enter'''.

Observe the output.
|-
|| Point to the output.
|| While searching for multiple files, '''grep''' shows the filename for each match.

In this example, '''grep demo dot t x t '''and '''not pass dot t x t '''are searched.
|-
|| Show only the inside files contents of '''notpass.txt '''and '''grepdemo.txt'''
|| These are the records from '''not pass dot t x t''' file and these are the records from '''grep demo dot t x t''' file.
|-
|| Type

'''grep -c “Fail” grepdemo.txt''' press '''Enter'''.
|| To display only the number of matches, use the '''hyphen c''' option.

Type this command and press the '''Enter '''key. Output shows the number of matches.

|-
|| '''Slide 8'''

'''Summary'''

In this tutorial, we have learnt to:
* View the content of a file
* List entries of a particular stream
* Ignore cases while searching
* Handle lines that do not match a pattern
* Display line numbers with the entries
* Store the result in another file
* Count the number of matches

|| With this we come to the end of this tutorial.

Let us summarise.
|-
|| '''Slide 9'''

'''Assignment'''

As an assignment# Use grep to find all students in the “Maths” stream in grepdemo.txt.
# List lines that do '''not''' contain civil and save to '''nonCivil.txt'''.
# Show line numbers of entries containing fail.
# Search for a multi-word pattern, for example Mani Chowdhari, in '''grepdemo.txt'''.

|| As an assignment, please do the following.
|-
|| '''Slide 10 Thank you'''

|| This Spoken Tutorial is brought to you by EduPyramids Educational Services Private Limited, SINE, IIT Bombay. Thank you.
|-
|}

@@ Line 259: / Line 259: @@
 ''' Thank you'''
+||  Thank you.
-|| This Spoken Tutorial is brought to you by EduPyramids Educational Services Private Limited, SINE, IIT Bombay. Thank you.
 |-
 |}

← Older revision	Revision as of 11:11, 24 March 2026
(No difference)

@@ Line 16: / Line 16: @@
 || Welcome to this spoken tutorial on '''Introduction to grep command'''.
 |-
-|| '''Slide 2 Learning Objectives'''
+|| '''Slide 2

@@ Line 248: / Line 248: @@
 # Use grep to find all students in the “Maths” stream in grepdemo.txt.
-# List lines that do '''not''' contain civil and save to '''nonCivil.txt'''.
+# List lines that do not contain civil and save to '''nonCivil.txt'''.
 # Show line numbers of entries containing fail.
 # Search for a multi word pattern, for example Mani Chowdhari, in '''grepdemo.txt'''.

@@ Line 250: / Line 250: @@
 # List lines that do '''not''' contain civil and save to '''nonCivil.txt'''.
 # Show line numbers of entries containing fail.
-# Search for a multi-word pattern, for example Mani Chowdhari, in '''grepdemo.txt'''.
+# Search for a multi word pattern, for example Mani Chowdhari, in '''grepdemo.txt'''.
 || As an assignment, please do the following.
 |-
-|| '''Slide 10 Thank you'''
+|| '''Slide 10'''

@@ Line 16: / Line 16: @@
 || Welcome to this spoken tutorial on '''Introduction to grep command'''.
 |-
-|| '''Slide 2 Learning Objectives&nbsp;&nbsp;'''
+|| '''Slide 2 Learning Objectives'''
-|| In this tutorial, we will learn to:* View the content of a file
+|| In this tutorial, we will learn to:
 * List entries of a particular stream
 * Ignore cases while searching
@@ Line 27: / Line 28: @@
 * Store the result in another file
 * Count the number of matches
 |-
 || '''Slide 3'''
-'''System&nbsp; Requirements'''
+'''System Requirements'''
 '''Ubuntu OS '''version 24 point zero 4
@@ Line 45: / Line 43: @@
 '''https://EduPyramids.org'''
@@ Line 54: / Line 51: @@
 And should be familiar with basic Linux terminal commands.
-For the prerequisite of Linux tutorials please visit this website.
+For the prerequisite Linux tutorials please visit this website.
 |-
 || '''Slide 5'''
@@ Line 60: / Line 57: @@
 '''Code Files'''
-The following code files are required to practice this tutorial.# '''grepdemo.txt'''
+The following code files are required to practice this tutorial.
 # '''igc-commands.txt'''
 These files are provided in the Code Files link of this tutorial page.
@@ Line 71: / Line 68: @@
 These files are provided in the Code Files link of this tutorial page.
 |-
-| |
+||
 || First let us learn about regular expressions.
 |-
@@ Line 77: / Line 74: @@
 '''Regular Expressions'''
-|| * Regular expressions are patterns used to match text.
+||
 * They help to search and filter information in files.
 * They can match words, numbers, or character sequences.
 * In Linux, commands like '''grep''' use regular expressions.
 |-
@@ Line 87: / Line 84: @@
 '''grep command '''
-|| * '''grep''' is a '''Linux''' command used to search text.
+||
 * It finds lines that match a given pattern.
 * It works on files or standard input.
 * It supports regular expressions for searching.
 |-
@@ Line 112: / Line 109: @@
 '''grep "computers" grepdemo.txt '''press enterShow side by side '''grepdemo.txt '''file entries.
-|| At the terminal type, '''grep space double quote computers double quote space grepdemo dot t x t '''and press '''Enter'''. The output shows entries from the computer’s stream.
+|| At the terminal type, '''grep space double quote computers double quote space grepdemo dot t x t '''and press '''Enter'''.
 Let us compare it with the original file.
 |-
 || Highlight Zubin entry in the file
-|| Notice that the entry for Zubin is missing. This happens because '''grep''' is case sensitive.
+|| Notice that the entry for Zubin is missing.
 |-
 || Point to the capital C
@@ Line 127: / Line 128: @@
 |-
 || Type '''grep -i "computers" grepdemo.txt '''Highlight '''-i'''press '''Enter'''
-|| Pattern matching is case sensitive by default.To make it case insensitive, we need to use the '''hyphen i '''option with '''grep'''.
+|| Pattern matching is case sensitive by default.
 Type this command and press '''Enter'''.
@@ Line 141: / Line 144: @@
 Point to the output.
-|| Type this command. The '''hyphen v '''option lists the lines that do not match a pattern. Press '''Enter '''to see the output.
+|| Type this command. The '''hyphen v '''option lists the lines that do not match a pattern.
 Output shows students who failed or have incomplete results.
 |-
-|| Show side by side home folder.Type '''grep -iv "pass" grepdemo.txt > notpass.txt''' press '''Enter'''.
+|| Show side by side home folder.
 || Let us store the output in a file named '''not pass dot t x t'''.
 Type this command and press''' Enter'''.The file is created successfully.
 |-
 || Type '''cat notpass.txt '''press '''Enter'''.
-|| To view the students who have not passed, type '''cat space not pass dot t x t '''and press '''Enter'''.Observe the output.
+|| To view the students who have not passed, type '''cat space not pass dot t x t '''and press '''Enter'''.
 |-
 || Type '''grep -i "fail" grepdemo.txt '''
@@ Line 158: / Line 166: @@
 Highlight''' '''output
-|| Type this command to list the failed students and press '''Enter'''.The output shows all students who have failed.
+|| Type this command to list the failed students and press '''Enter'''.
 |-
 || type
@@ Line 165: / Line 175: @@
-press enter
+Press Enter.
 || Let us use the '''hyphen n '''option to show line numbers with matching entries.
@@ Line 175: / Line 185: @@
 || Let us clear the terminal screen.
 |-
-|  |
+||
-|| So far, we used single-word patterns. For multi-word patterns, we have to put the entire pattern in quotes.
+|| So far, we used single-word patterns.
 |-
 || type
@@ Line 190: / Line 202: @@
 press''' Enter'''.
-|| We can also find patterns in multiple files.Type this command and press''' Enter'''.
+|| We can also find patterns in multiple files.
 Observe the output.
@@ Line 231: / Line 245: @@
 '''Assignment'''
-As an assignment# Use grep to find all students in the “Maths” stream in grepdemo.txt.
+As an assignment,
 # List lines that do '''not''' contain civil and save to '''nonCivil.txt'''.
 # Show line numbers of entries containing fail.