devops-notes/01_Linux_Basics.md

Linux – Basic Commands (Day 1)

What is Linux?

Linux is an operating system used to run servers and applications.

Why Linux is important for DevOps?

Most servers run on Linux, and DevOps engineers manage everything using Linux commands.

Linux Folder Structure

• / → root
• /home → user files
• /etc → configuration files
• /var → logs and data
• /bin → system commands

Navigation Commands

pwd        # show current directory
ls         # list files
ls -l      # detailed list
ls -a      # show hidden files
cd folder  # move into folder
cd ..      # go back
cd ~       # go to home

Create & Delete Commands

mkdir app
touch file.txt
rm file.txt
rm -r app

Working with File Content

cat file.txt
head file.txt
echo "Linux for DevOps" > info.txt     # write content
echo "Day 1 completed" >> info.txt    # append content
cat info.txt                          # view file content

Daily Useful Linux Commands

clear       # clear terminal screen
history     # show command history
whoami      # show current user
uname -a    # show system information