Files & Directories
ls -la / cd / pwd / mkdir -p
cp -r src/ dest/ / mv old new / rm -rf dir/
find / -name "*.log"
Text Processing
cat / less / head / tail -f
grep "error" /var/log/nginx/error.log
nano file.txt / vim file.txt
System
uname -a / df -h / free -h / htop
systemctl status nginx
ps aux | grep nginx / kill -9 PID
Networking
ip addr / ping / curl -I / wget URL / ss -tlnp
Permissions
chmod 755 script.sh
chown -R www-data:www-data /var/www
Archives
tar -czf archive.tar.gz dir/
tar -xzf archive.tar.gz
zip -r archive.zip dir/ / unzip archive.zip