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Linux Command Line Tutorial For Beginners 37 - grep command Video Lecture | Complete Linux Course: Become a Linux Professional - Software Development
FAQs on Linux Command Line Tutorial For Beginners 37 - grep command Video Lecture - Complete Linux Course: Become a Linux Professional - Software Development
| 1. What is the grep command used for in Linux? |  |
Ans. The grep command in Linux is used to search for specific patterns or words within files or directories. It allows users to search for text by using regular expressions and provides various options to customize the search.
| 2. How to search for a specific word in a file using grep? | |
Ans. To search for a specific word in a file using grep, you can use the following command:
```
grep "word" filename
```
Replace "word" with the actual word you want to search for and "filename" with the name of the file you want to search within.
| 3. Can grep search for a pattern in multiple files at once? | |
Ans. Yes, grep can search for a pattern in multiple files at once. You can specify multiple filenames or use wildcards to search in a group of files. Here's an example:
```
grep "pattern" file1.txt file2.txt file3.txt
```
This command will search for the specified pattern in file1.txt, file2.txt, and file3.txt simultaneously.
| 4. How to make grep case-insensitive during a search? | |
Ans. To make grep case-insensitive during a search, you can use the "-i" option. Here's an example:
```
grep -i "pattern" filename
```
This command will search for the specified pattern in the file, ignoring the case of the letters.
| 5. Can grep search for patterns in directories and subdirectories recursively? | |
Ans. Yes, grep can search for patterns in directories and subdirectories recursively using the "-r" or "-R" option. Here's an example:
```
grep -r "pattern" directory
```
This command will search for the specified pattern in all files within the directory and its subdirectories.
Text Transcript from Video
hello guys welcome to the next video on
Linux command line to total beginners in
this video we will learn how to use
graph command in Linux graph sense for
global regular expression print now
graph graph command processes text line
by line and print any line which matches
our specified pattern
so grab command can be used to search
some kind of pattern or word or sentence
in a text file or number of text file
using this graph command and some
options with graph c'mon so let's see
how we can use grab command so first of
all I need to have for example compile
to use this crap command so I'm going to
just change my directory to desktop
first of all and then here I am going to
create a file for example what I'm going
to do is I'm going to use man and I'm
going to use star and I'm going to dump
the man page of star to a file for
example I'm going to name it as file dot
txt okay and then press ENTER it is
going to create file you can see the
file is created and when I'm going to
open this file it's going to show the
kind of man command output for the town
right now I can use grab command on this
file so I'm going to clear the terminal
first of all and then let's open this
file and let's see what we want the
source for example for example I want to
search for this word in this file called
option right so I can use this command
grab and then the pattern which I want
to search for for example I want to
search for options right so I will just
write options here and then the name of
the file in which I want to search my
pattern in okay
so grap and then the word I want to
search and then the file name and then
press ENTER and you can see it has
searched the line which are containing
the option key word right and when I
open this file again we're going to show
up so you can see this line is
containing the option so this line has
the spot name also so you can see this
line is printed and then let's search
here in the G edit editor also then you
can see this line also contain 2 or
option key word which is this line right
and then we will go down you can see the
options with the capital letter is not
such because this crap command is case
sensitive by default but we can use a
flag called I to make it case
insensitive and we are going to see in
the next command but this will not be
searched because the graph command is
case sensitive right we will go little
bit down and hopefully we see the next
option line this is the next options
line this is this one right so all the
line containing option keyword is
searched and printed right now I was
talking about the case sensitive option
right so to make the graph command to
look for case insensitive word also so
capital loss small the matter you can
use eyes lab with it ok so if you use I
flag then it's going to search for
capital loss small letter words and when
I print ENTER you can see it search for
small letter options mine also and you
can see it searches for the capital
letter options keyboard also right now
for example I want to print
the line number in which this result is
appearing so I want to print the first
of all line number and then the result
so I can use the option called the for
example N and is for printing the line
number right I can adjust remove this I
which is for case in some particular
right and when I print enter you can see
on the line 9 I have this option then 17
and then 348 so I can prove this by just
saying this so you can see this is line
9 you can see here line 9 column 29
right and then next is 17 here you can
see line number right so join the
collect result well now next is the
flack we can use to for example we can
use multiple you know keyword here also
so it doesn't you know it's not
necessary that this has to be a word it
can be a sentence also right so for
example I will do it once again and this
time instead of option I will just see
in the text what I want to search for
example so I want to search for some
options line okay not the keyword option
but the sentence for example some option
and instead of options I will just give
this keyword called some option so come
option and then click enter I just shows
the line which contains this pattern
which is some option so once again the
line number is 17 as we know it
search for this line only okay
so this is also you can use you know
graph command so you can also use graph
command visit multiple file so let me
clear the terminal
and let me copy this file into different
files so for example file two and then
I'm going to create file three also for
example and then file for also okay and
then I want to search in these all four
files something so let's search for this
same option in different files so you
can use the same command grab and - any
for line number and then your pattern or
sentence whatever you want to search and
then the file name so it can be for file
name and then while - for example and
then file 3 if you want to certain file
3 and also file for if you want to
search in file for and then press Enter
and now you can see it giving the name
of the file for and then the 9 number so
file look dot txt contains just a
pattern then file - dot txt contains
this pattern on this line then file 3
contains this on this line and then file
for also contains on this you know this
pattern on this line right now this
command you have to type all the file
names right this can be made simpler
with a wild-card so instead of writing
this when you use s click it means all
the files in this folder right so it
means so v 1 v 2 v 3 and file for
because these are the file which are
there in the Desktop folder so this
Astrix means that it's a wild card and
it means that it's going to search for
all the files and press Enter it's going
to search or give the same result
- you okay now sometimes you want to
search for the line for example in the
inverse manner so just search for the
line which doesn't contain this pattern
for example
right so you can use a flag let me clear
the terminal first of all and once again
use a graph command and then whenever
you use this V flag it means invert
match which means that all the you know
lines which doesn't contain this pattern
is going to show these lines okay so
it's the invert match okay and let me
just you only one file for now file dot
exe in then press enter
it's showing all the line which doesn't
contain this word which we are searching
for let me also show the line number
also so 10 I'm going to show the line
number so it's only showing the line
which doesn't contain the keyword which
is some options right you can verify
from here the terminal is not printing
all the you know lines right but when
you verify it it's not going to show you
the line number 17 because this contains
the term pattern which we are searching
for okay so there are many are you know
flags and options which you can use it
graph command I just wanted to give you
the introduction the gap crap command so
go ahead and just use gap - H - that's
right graph - H here and then press
Enter it shows that to use help you need
to use this command so not - H but graph
- - help okay just use this - myself and
then it's going to show you all the flag
and options which you can use with the
you know graph command
so I hope you enjoyed this video please
rate comment subscribe and bye for now
Linux command line to total beginners in
this video we will learn how to use
graph command in Linux graph sense for
global regular expression print now
graph graph command processes text line
by line and print any line which matches
our specified pattern
so grab command can be used to search
some kind of pattern or word or sentence
in a text file or number of text file
using this graph command and some
options with graph c'mon so let's see
how we can use grab command so first of
all I need to have for example compile
to use this crap command so I'm going to
just change my directory to desktop
first of all and then here I am going to
create a file for example what I'm going
to do is I'm going to use man and I'm
going to use star and I'm going to dump
the man page of star to a file for
example I'm going to name it as file dot
txt okay and then press ENTER it is
going to create file you can see the
file is created and when I'm going to
open this file it's going to show the
kind of man command output for the town
right now I can use grab command on this
file so I'm going to clear the terminal
first of all and then let's open this
file and let's see what we want the
source for example for example I want to
search for this word in this file called
option right so I can use this command
grab and then the pattern which I want
to search for for example I want to
search for options right so I will just
write options here and then the name of
the file in which I want to search my
pattern in okay
so grap and then the word I want to
search and then the file name and then
press ENTER and you can see it has
searched the line which are containing
the option key word right and when I
open this file again we're going to show
up so you can see this line is
containing the option so this line has
the spot name also so you can see this
line is printed and then let's search
here in the G edit editor also then you
can see this line also contain 2 or
option key word which is this line right
and then we will go down you can see the
options with the capital letter is not
such because this crap command is case
sensitive by default but we can use a
flag called I to make it case
insensitive and we are going to see in
the next command but this will not be
searched because the graph command is
case sensitive right we will go little
bit down and hopefully we see the next
option line this is the next options
line this is this one right so all the
line containing option keyword is
searched and printed right now I was
talking about the case sensitive option
right so to make the graph command to
look for case insensitive word also so
capital loss small the matter you can
use eyes lab with it ok so if you use I
flag then it's going to search for
capital loss small letter words and when
I print ENTER you can see it search for
small letter options mine also and you
can see it searches for the capital
letter options keyboard also right now
for example I want to print
the line number in which this result is
appearing so I want to print the first
of all line number and then the result
so I can use the option called the for
example N and is for printing the line
number right I can adjust remove this I
which is for case in some particular
right and when I print enter you can see
on the line 9 I have this option then 17
and then 348 so I can prove this by just
saying this so you can see this is line
9 you can see here line 9 column 29
right and then next is 17 here you can
see line number right so join the
collect result well now next is the
flack we can use to for example we can
use multiple you know keyword here also
so it doesn't you know it's not
necessary that this has to be a word it
can be a sentence also right so for
example I will do it once again and this
time instead of option I will just see
in the text what I want to search for
example so I want to search for some
options line okay not the keyword option
but the sentence for example some option
and instead of options I will just give
this keyword called some option so come
option and then click enter I just shows
the line which contains this pattern
which is some option so once again the
line number is 17 as we know it
search for this line only okay
so this is also you can use you know
graph command so you can also use graph
command visit multiple file so let me
clear the terminal
and let me copy this file into different
files so for example file two and then
I'm going to create file three also for
example and then file for also okay and
then I want to search in these all four
files something so let's search for this
same option in different files so you
can use the same command grab and - any
for line number and then your pattern or
sentence whatever you want to search and
then the file name so it can be for file
name and then while - for example and
then file 3 if you want to certain file
3 and also file for if you want to
search in file for and then press Enter
and now you can see it giving the name
of the file for and then the 9 number so
file look dot txt contains just a
pattern then file - dot txt contains
this pattern on this line then file 3
contains this on this line and then file
for also contains on this you know this
pattern on this line right now this
command you have to type all the file
names right this can be made simpler
with a wild-card so instead of writing
this when you use s click it means all
the files in this folder right so it
means so v 1 v 2 v 3 and file for
because these are the file which are
there in the Desktop folder so this
Astrix means that it's a wild card and
it means that it's going to search for
all the files and press Enter it's going
to search or give the same result
- you okay now sometimes you want to
search for the line for example in the
inverse manner so just search for the
line which doesn't contain this pattern
for example
right so you can use a flag let me clear
the terminal first of all and once again
use a graph command and then whenever
you use this V flag it means invert
match which means that all the you know
lines which doesn't contain this pattern
is going to show these lines okay so
it's the invert match okay and let me
just you only one file for now file dot
exe in then press enter
it's showing all the line which doesn't
contain this word which we are searching
for let me also show the line number
also so 10 I'm going to show the line
number so it's only showing the line
which doesn't contain the keyword which
is some options right you can verify
from here the terminal is not printing
all the you know lines right but when
you verify it it's not going to show you
the line number 17 because this contains
the term pattern which we are searching
for okay so there are many are you know
flags and options which you can use it
graph command I just wanted to give you
the introduction the gap crap command so
go ahead and just use gap - H - that's
right graph - H here and then press
Enter it shows that to use help you need
to use this command so not - H but graph
- - help okay just use this - myself and
then it's going to show you all the flag
and options which you can use with the
you know graph command
so I hope you enjoyed this video please
rate comment subscribe and bye for now
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Dec 22, 2024 Last updated |
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