#90daysofdevops #day2

Linux is an open-source operating system kernel that serves as the foundation for various Linux-based operating systems, also known as Linux distributions (e.g., Ubuntu, CentOS, Debian). Linux is known for its stability, security, and versatility and is widely used in servers, embedded systems, and as a desktop operating system.

Here are the Linux commands you've requested:

1. Check your present working directory:

    pwd
   

2. List all the files or directories, including hidden files, in the current directory:

    ls -a
   

3. Create a nested directory structure A/B/C/D/E: You can create this nested directory structure using the mkdir command with the -p option to create parent directories as needed. For example:

    mkdir -p A/B/C/D/E
   

   This command will create the directories A, B, C, D, and E as needed within each other, resulting in the nested structure.