Great choice! Learning the Linux command line will give you much more control and flexibility with Ubuntu. Here’s a structured overview of the most important commands you’ll want to know as you get started:

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🔎 System Navigation & File Management

• pwd → Show your current directory (print working directory).

• ls → List files and folders in the current directory.

  • Options: ls -l (detailed), ls -a (show hidden), ls -lh (human-readable sizes).

• cd <path> → Change directory (e.g., cd /home/user/Documents).

• mkdir <name> → Create a new directory.

• rmdir <name> → Remove an empty directory.

• touch <file> → Create an empty file.

• cp <src> <dest> → Copy files or directories (-r for directories).

• mv <src> <dest> → Move or rename files.

• rm <file> → Delete files (-r for directories, -f to force).

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📄 Viewing & Editing Files

• cat <file> → Show file contents.
• less <file> → View file contents page by page.
• head <file> → Show the first 10 lines of a file.
• tail <file> → Show the last 10 lines of a file (tail -f follows updates, useful for logs).
• nano <file> → Simple text editor.
• vim <file> → Advanced text editor (steeper learning curve).

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👤 User & Permissions

• whoami → Show current user.
• id → Show user and group info.
• chmod <mode> <file> → Change file permissions (e.g., chmod 755 script.sh).
• chown <user>:<group> <file> → Change file owner.
• sudo <command> → Run command as administrator.

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📦 Package Management (Ubuntu / Debian)

• apt update → Refresh package list.
• apt upgrade → Upgrade installed packages.
• apt install <package> → Install a new package.
• apt remove <package> → Uninstall a package.
• apt search <keyword> → Search available packages.

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⚙️ System Information

• uname -a → Kernel and system details.
• df -h → Show disk usage (human-readable).
• du -sh <dir> → Show size of a directory.
• free -h → Show memory usage.
• top or htop → Show running processes.
• ps aux → List all processes.
• uptime → Show how long the system has been running.
• who → Show logged-in users.

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🌐 Networking

• ping <host> → Test connectivity.
• ip a → Show network interfaces and IPs.
• curl <url> → Fetch content from a URL.
• wget <url> → Download a file.
• ssh user@host → Connect to a remote server.

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📂 Searching & Finding

• find <path> -name <file> → Search for files by name.
• grep <pattern> <file> → Search for text inside files.
• locate <name> → Find files (uses a prebuilt index, run updatedb first).

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🛠️ Other Useful Commands

• history → Show previously used commands.
• clear → Clear the terminal screen.
• alias → Create shortcuts (e.g., alias ll='ls -lh').
• man <command> → Open manual/help for a command.

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👉 Tip: Practice is key! Try exploring /home, /etc, and /var/log with these commands.

Would you like me to make you a cheat sheet PDF with all of these commands nicely formatted, so you can keep it handy while learning?