Why is Linux Important for DevOps?
Linux is the backbone of DevOps for several reasons:
Most servers and automation tools run on Linux.
Major cloud platforms (AWS, Azure, GCP) rely on Linux-based systems.
Shell scripting and command-line operations are essential for automation.
Basic Linux Commands for DevOps
Navigating the File System
pwd – Check your current directory.
ls – List files and folders.
cd – Change directory.
mkdir – Create a new folder.
rmdir – Remove an empty folder.
Example:
pwd
ls
cd /home
mkdir myfolder
rmdir myfolder
File Operations
touch – Create a new file.
cat – Display file content.
nano / vi – Edit a file.
rm – Delete a file.
Example:
touch myfile.txt
cat myfile.txt
nano myfile.txt
rm myfile.txt
User & Permission Management
whoami – Check the current user.
chmod – Change file permissions.
chown – Change file ownership.
Example:
whoami
chmod 755 myscript.sh
chown user:user myfile.txt
Introduction to Shell Scripting
Automation is key in DevOps, and shell scripting helps automate repetitive tasks.
Simple Bash Script Example:
#!/bin/bash
echo "Hello, DevOps World!"
date
Steps to Run the Script:
Create the file: nano myscript.sh
Write the script and save it.
Set execute permission: chmod +x myscript.sh
Run the script: ./myscript.sh
Shell scripting is the foundation of automation in DevOps. In upcoming posts, we’ll explore more advanced scripting techniques!