Here is day 3 of #90days of DevOps.

In today’s blog, we will handle files using Linux commands.

Tasks: What is the Linux command to…

To view what's written in a file.
- To view the content of the file run the command cat <filename>
To change the access permissions of files.
- Run chmod 777 <foldername>
To check which commands you have run till now.
- history as the name suggests is used to view all the commands which we have run.
To remove a directory/ Folder.
- We can remove a directory by using rm -r <directory name> or rm -rf <directory name>, where -r flag is used for recurring since the directory won’t be empty. It is not advised to use “-rf” since it is done when we forcefully need to delete the repository.
To create a fruits.txt file and to view the content.
- We can create files using various methods such as echo, touch, vim, nano etc. Let’s see example using each method.
  - echo “Hello there” >> fruits.txt
  - touch fruits.txt
    - touch is used to create a blank file.
  - nano fruits.txt
  - vim fruits.txt
  - cat fruits.txt
Add content in fruits.txt (One in each line) - Apple, Mango, Banana, Cherry, Kiwi, Orange, Guava.
- Add content in fruits.txt
To Show only top three fruits from the file.
- run head -3 fruits.txt
To Show only bottom three fruits from the file.
- run tail -3 fruits.txt
To create another file colors.txt and to view the content.
- vim color.txt
Add content in colors.txt (One in each line) - Red, Pink, White, Black, Blue, Orange, Purple, Grey.
- Add the content in colors.txt file
To find the difference between fruits.txt and Colors.txt file.

Conclusion:

We have learnt various file actions using Linux commands. In the next blog, we will see more about shell scripting.

Day 3 of 90days of DevOps