Introduction

The Arch Linux command line is incredibly powerful, but let’s be honest: nobody memorizes everything. Between obscure pacman package manager flags, systemd troubleshooting syntaxes, and the specific layouts required for modern copy-on-write filesystems like Btrfs, it’s completely normal to blank on a command from time to time.

Whether you are running a pure Arch setup or a high-performance distribution like CachyOS, you don’t need to keep a dozen browser tabs open to look up basic syntax. Keep this practical cheat sheet bookmarked right here on your workbench. Here are the essential terminal commands you will actually use to maintain, clean, and troubleshoot your system.

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The Arch Linux Terminal Survival Guide: Essential Commands We All Forget

Introduction

The Arch Linux command line is incredibly powerful, but let’s be honest: nobody memorizes everything. Between obscure pacman package manager flags, systemd troubleshooting syntaxes, and the specific layouts required for modern copy-on-write filesystems like Btrfs, it’s completely normal to blank on a command from time to time.

Whether you are running a pure Arch setup or a high-performance distribution like CachyOS, you don’t need to keep a dozen browser tabs open to look up basic syntax. Keep this practical cheat sheet bookmarked right here on your workbench. Here are the essential terminal commands you will actually use to maintain, clean, and troubleshoot your system.

📦 1. Arch & CachyOS Package Management (Pacman & AUR)

We all know how to run a basic system upgrade, but some of the deep-cleaning and search commands use flags that look like absolute alphabet soup.

• Clean out the package cache (Free up disk space):Bashsudo pacman -Scc What it does: Removes all cached package files that are downloaded during updates. Great for instantly reclaiming gigabytes of drive space if your root partition is getting full.
• Find and remove “orphan” packages:Bashsudo pacman -Rns $(pacman -Qtdq) What it does: Finds packages that were installed as dependencies for other software but are no longer needed by anything else on your system, and wipes them out cleanly along with their configuration files.
• Search for a package in the official repositories:Bashpacman -Ss package_name

💾 2. Btrfs Filesystem & Snapshot Operations

If you are running a modern Btrfs layout, you get incredible stability and instant backups—but the subvolume syntax is notoriously easy to mix up.

• List all active subvolumes on your drive:Bashsudo btrfs subvolume list /
• Check the real, raw disk space usage of a Btrfs drive:Bashsudo btrfs filesystem usage / Why you need it: Standard commands like df -h often report inaccurate free space on Btrfs systems because of how snapshots and background compression work. This command gives you the real ground truth.
• Manually trigger a filesystem “trim” (Excellent for SSD health):Bashsudo fstrim -va

⚙️ 3. Systemd Troubleshooting & Logs

When a background service breaks, or a remote connection tool isn’t responding, systemd is where you go to find out exactly why.

• View the live, real-time log output for a specific service:Bashsudo journalctl -u rustdesk -f What it does: The -u specifies the unit name (like rustdesk), and the -f means “follow,” printing new log events to your screen the exact second they happen.
• Check the system logs for errors from only the current boot:Bashsudo journalctl -b -p 3 What it does: Filters out all the harmless background noise and shows you only severe system errors (-p 3) that have occurred since you last turned your machine on.
• Check if a specific background service is running or blocked:Bashsystemctl status service_name

🌐 4. Network & Remote Port Checking

Before trying to connect to a remote machine, you often need to check if the network ports are actually open and listening on your end.

• See which applications are listening on your network ports:Bashsudo ss -tulpn What it does: Displays a clean table of every active network connection, showing exactly which port numbers (like RustDesk’s critical ports) are open and which software service owns them.
• Quickly check your machine’s current local IP address:Baship a

💡 Quick Tips for Terminal Mastery

• The ultimate fallback: If you remember a command but can’t remember its specific flags, append --help or type man command_name to open its official manual page.
• Search your history: Press Ctrl + R in your terminal and start typing any word from a command you ran last week—the shell will instantly pull up the exact line for you!

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