Now it's time to learn some basics to advance Linux commands!!🐧

To view what's written in a file?

using the cat command you can able to reads data from the file and gives its content as output.
- To change the access permissions of files
  
  using the chmod command you can change the access permission of a file.
  
  Permissions can be changed using two modes:
  
  i)Symbolic mode
  
  examples: chmod u+x file.txt
  
  ii)Numeric mode
  
  example: chmod 777 file.txt
- To check which commands you have run till now
  
  history command is used to check the commands you have run till now.
  
  example:
- To remove a directory/ Folder.
  
  To remove an empty directory, use the rmdir command.
  
  example:
  
  rmdir xyzfoldername
- To remove a directory and all its contents, including any subdirectories and files use: rm
  
  example :
  
  rm -r xyzfoldername (it will remove the dir including the contents inside it)

To create a fruits.txt file and view the content.

We are going to use the touch command to create the file and the cat command to view the content of the file

touch fruits.txt

echo "fruits are good for health" > fruits.txt

cat fruits.txt

fruits are good for health

Add content in devops.txt (One in each line) - Apple, Mango, Banana, Cherry, Kiwi, Orange, Guava.

Add content to the fruits.txt file by using the vim editor

vim fruits.txt

Press i (insert)

Apple

Mango

banana

Cherry

Esc(escape)

:wq(write and quit that file)
Show only the top three fruits from the file.

head -n 3 devops.txt

Apple

Mango

Banana
Show only the bottom three fruits from the file.

tail -n 3 devops.txt

Kiwi

Orange

Guava
To create another file Colors.txt and to view the content.

touch Colors.txt

"cat colors.txt"
Add content in Colors.txt (One in each line) - Red, Pink, White, Black, Blue, Orange, Purple, and Grey.

vim Colors.txt

Red

Pink

White

Black

Blue

Orange

Purple

Grey

esc(enter escape)

:wq( write and quit that file)
To find the difference between the fruits.txt and Colors.txt file

To find the difference between the content of the two files we can use the diff command.
eg
diff fruits.txt Colors.txt

Thank you very much for giving your valuable time for reading this article !!☺😊

Arijit Manna

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