Linux is one of the most powerful and widely used operating systems in the world. It powers everything from personal computers and servers to cloud infrastructure, embedded systems, and even Android smartphones. Because of its stability, flexibility, and open-source nature, Linux has become the foundation of modern cybersecurity, system administration, and DevOps environments. Linux Philosophy Everything is a File Small, Single-Purpose Programs Ability to Chain Programs Together Avoid Captive User Interfaces Configuration Stored in Text Files Linux File System Structure / (Root Directory) /bin /boot /dev /etc /home /lib /media /mnt /opt /root /sbin /tmp /usr /var Popular Linux Distributions Ubuntu Debian Fedora CentOS / Rocky Linux Kali Linux Parrot OS Raspberry Pi OS Introduction to the Linux Shell Basic Linux Command Syntax System Information Commands Display Current User Show User Identity Display Hostname Show Operating System Information Show Current Directory Networking Commands Ping Traceroute Netstat IP Command SSH (Secure Shell) File Management in Linux Create a File Create a Directory Rename or Move Files User Management Commands Create a User Delete a User Change Password Switch User Run Command as Administrator Package Management APT DPKG Snap Pip Git Useful Terminal Shortcuts Auto-Complete Move Cursor Clear Terminal Stop a Running Process Search Command History
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