Managing a Linux server is built on being comfortable with the command line. Without a graphical interface, you can manage the entire system with a few dozen commands. This guide offers a practical reference of the most-used Linux server commands, grouped by function.
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Navigation and File Operations
The first thing you do after connecting to a server is navigate the file system. These commands cover listing, creating, copying and deleting files and directories.
| Command | Function |
|---|---|
pwd | Shows the full path of your current directory |
ls -lah | Lists files with size and permissions, including hidden ones |
cd /path | Moves to the specified directory |
cp src dst | Copies a file/directory |
mv src dst | Moves or renames |
rm -i file | Deletes with a confirmation prompt |
mkdir -p a/b/c | Creates nested directories |
Viewing File Content and Searching
Reading configuration files, inspecting logs and searching text is an important part of daily administration.
cat file— prints the entire content of short files.less file— shows long files page by page, scrollable.tail -f /var/log/...— follows a log file live.grep "text" file— searches for text within a file.find /path -name "*.log"— finds files matching a pattern.
System and Resource Monitoring
To understand your server's health you need to monitor CPU, memory and disk usage. These commands are the starting point for troubleshooting.
| Command | Function |
|---|---|
top / htop | Live CPU, memory and process monitoring |
df -h | Fill level of disk partitions |
du -sh * | Folder sizes in the current directory |
free -h | RAM and swap usage |
uptime | Uptime and load average |
Process Management
You use these commands to see running programs, terminate a stuck process or check a service's status: ps aux lists all processes, kill PID terminates a process, and systemctl status service shows a service's state. We will cover service management in depth in a separate guide.
Networking and Connection Commands
ip a— shows network interfaces and IP addresses.ping domain— tests reachability of a target.curl -I https://site— fetches a URL's HTTP response headers.ss -tulpn— lists listening ports and services.
man command (the manual page) or command --help. You can find where a command lives with which command.Permission and Package Commands
System-level operations require administrator privileges; you prefix the command with sudo. To install software you use your distribution's package manager: apt on Debian/Ubuntu, dnf on RHEL/Rocky. We will examine file permissions and package management in detail in later articles of this series.
Frequently Asked Questions
Do I need to memorize all these commands?
No. For daily use 15-20 commands are enough; you learn the rest from man pages as needed. They become permanent with practice.
How do I view command history?
The history command lists previous commands. You can scroll recent commands with the up arrow and search history with Ctrl+R.
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