Linux commands for DevOps - Part 1

1. Print Working Directory :

   This command will print your directory location, where you currently working

   

2. Change Directory :

   cd path_to_directory --> display Change Path to directory

   cd ~ or just cd --> Change directory to the home directory

   cd - --> Go to the last working directory.

   cd .. --> Change directory to one step back.

   cd ../.. --> Change directory to 2 levels back.

   

3. Make Directory :

   mkdir newFolder --> make a new folder 'newFolder'

   mkdir .NewFolder --> make a hidden directory (also . before a file to make it hidden)

   mkdir A B C D --> make multiple directories at the same time

   mkdir /home/user/Mydirectory --> make a new folder in a specific location

   mkdir -p A/B/C/D --> make a nested directory

   

   

4. View / Modify Contents of File :

   This is used to concatenate and display files on the terminal. It can also be used to modify existing ones.

   cat -b: This adds line numbers to non-blank lines

   cat -n: This adds line numbers to all lines

   

5. History :

   This command is used to view the previously executed command.

   history :

   history n : Will give you the last n executed commands

   

6. Remove :

   rm [options] [file or directory name]

   The different rm command options include:

   -f: Forces the removal of all files or directories.

   -i: Prompts for confirmation before removing.

   -r: Removes directories and their content recursively

   

7. Top & Tail :

   Show the top n or bottom n lines of the file. This is greatly useful for DevOps engineers to analyze log files

   head filename (Default 10 lines are displayed)

   head -n filename

   

   tail filename (Default 10 lines are displayed)

   tail -n filename

   

8. Diff:

   This command is used to find the difference between two files.

   diff file1.txt file2.txt

   

Now that you've familiarized yourself with these essential Linux commands for DevOps, it's time to roll up your sleeves and put your newfound knowledge into practice. Consider setting up a virtual environment using tools like VirtualBox or Vagrant, or leverage cloud resources on platforms such as AWS, Azure, or Google Cloud.

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