Linux Ubuntu Commands Cheat Sheet

Basic Commands

• Update Package List: sudo apt update
• Upgrade Packages: sudo apt upgrade
• Install Package: sudo apt install <package_name>
• Remove Package: sudo apt remove <package_name>
• Search Package: apt search <package_name>

File and Directory Management

• List Files: ls
• Change Directory: cd <directory>
• Create Directory: mkdir <directory_name>
• Remove Directory: rmdir <directory_name>
• Copy File: cp <source> <destination>
• Move/Rename File: mv <source> <destination>
• Remove File: rm <file_name>

File Permissions

• Change Permissions: chmod <permissions> <file_name>
• Change Ownership: chown <user>:<group> <file_name>

System Information

• Check Disk Usage: df -h
• Check Memory Usage: free -h
• List Processes: ps aux
• Check CPU Usage: top or htop

Networking

• Check IP Address: ip a or ifconfig
• Ping Host: ping <host>
• Check Open Ports: netstat -tuln

Apache Commands

• Restart Apache: sudo systemctl restart apache2
• Stop Apache: sudo systemctl stop apache2
• Start Apache: sudo systemctl start apache2
• Check Apache Status: sudo systemctl status apache2

User Management

• Add User: sudo adduser <username>
• Delete User: sudo deluser <username>
• Change User Password: sudo passwd <username>

Package Management

• List Installed Packages: dpkg --list
• Show Package Details: apt show <package_name>
• Clean Package Cache: sudo apt autoremove and sudo apt clean

Log Files

• View Log File: cat /var/log/<log_file>
• Follow Log File: tail -f /var/log/<log_file>

This should cover the essentials! Let me know if you need more specific commands or details.