Useful Linux Commands
Efficient server management requires the right tools. Use the overview below to jump directly to the specific command categories.
Network & Processes
Check Port Usage
Which process is currently blocking a specific port?
lsof - Port Check
lsof -i tcp:80
Listening Connections
List all active programs waiting for incoming connections.
netstat -plunt
netstat -plunt
File Management
Determine Directory Sizes
Find the largest space consumers within a specific path.
du - Disk Usage
du -h --max-depth=1 /var/log
Locate Large Files
Search the entire system for files larger than 100MB.
find - Large Files
find / -type f -size +100M
Live Log Monitoring
Output new log entries to the screen in real-time.
tail -f
tail -f /var/log/syslog
System Analysis
Disk Write Load (I/O)
Which service is causing the highest load on your storage?
iotop - I/O Monitor
iotop -o
Resource Overview (htop)
Interactive overview of CPU, RAM, and all running processes.
htop
htop
Productivity
Search Command History
Quickly find a command you used previously.
history search
history | grep "ssh"
Copy Files via SSH
Securely transfer files or directories between servers.
scp transfer
scp -r /local/path user@remote-ip:/destination/path
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