System Tools Guide

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Why Use System Tools?

• Performance Monitoring: Track CPU, memory, and disk usage in real-time
• Resource Management: Identify and manage resource-intensive processes
• Productivity: Enhanced terminal capabilities and workflow optimization
• Troubleshooting: Diagnose and resolve system issues quickly
• Disk Management: Monitor and optimize storage usage

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Process and Resource Monitoring

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Terminal Enhancement Tools

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System Monitoring with htop

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Key Features

• Real-time Monitoring: Live CPU, memory, and swap usage
• Process Management: Kill, prioritize, and filter processes
• Interactive Interface: Mouse and keyboard support
• Color-coded Display: Easy-to-read visual indicators
• Tree View: See process hierarchies and relationships

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Common Use Cases

# Launch htop
htop

# Navigate with:
# - Arrow keys to scroll
# - F9 to kill processes
# - F6 to sort by column
# - F5 for tree view
# - q to quit

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Disk Management

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Checking Disk Space

# View disk usage summary
df -h

# Check specific directory size
du -sh /home/username

# Find largest directories
du -ahx / | sort -rh | head -n 10

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Using ncdu for Disk Analysis

# Analyze current directory
ncdu .

# Analyze home directory
ncdu ~

# Analyze entire system
sudo ncdu /

• Use arrow keys to browse directories
• Press Enter to enter a directory
• Press ‘d’ to delete files/directories
• Press ‘q’ to quit

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Terminal Multiplexing with tmux

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Essential tmux Commands

# Start new session
tmux

# Start named session
tmux new-session -s development

# List sessions
tmux list-sessions

# Attach to session
tmux attach-session -t development

# Detach from session (keeps running)
Ctrl+b then d

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Window and Pane Management

# Create new window
Ctrl+b then c

# Switch between windows
Ctrl+b then 0-9

# Split pane horizontally
Ctrl+b then "

# Split pane vertically
Ctrl+b then %

# Navigate between panes
Ctrl+b then arrow keys

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Use Cases

• Run long-running processes that persist after logout
• Organize development environment into multiple panes
• Work on multiple projects simultaneously
• Maintain SSH sessions that survive disconnections

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Enhanced Shell with Zsh and Oh My Zsh

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Zsh Features

• Smart Auto-completion: Context-aware tab completion
• Spell Correction: Automatic command correction suggestions
• Shared History: Command history across all sessions
• Advanced Globbing: Powerful file pattern matching
• Theming Support: Customizable prompts and colors

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Oh My Zsh Benefits

• 200+ Plugins: Git, Docker, Node.js, and more
• 140+ Themes: Customize your prompt appearance
• Auto-update: Keep your configuration current
• Community: Large ecosystem of extensions

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Popular Oh My Zsh Plugins

plugins=(
  git              # Git aliases and completion
  docker           # Docker completion
  node             # Node.js aliases
  npm              # npm completion
  sudo             # Prefix last command with sudo
  zsh-autosuggestions  # Command suggestions
  zsh-syntax-highlighting  # Syntax highlighting
)

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Process Management

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Finding and Killing Processes

# Find process on port 3000
sudo lsof -t -i:3000

# Kill process on port 3000
sudo kill -9 $(sudo lsof -t -i:3000)

# Alternative using fuser
sudo fuser -k 3000/tcp

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Common Port Conflicts

• 3000: React development server
• 8080: Common web server
• 5000: Flask development server
• 8000: Django development server
• 5432: PostgreSQL database
• 3306: MySQL database
• 27017: MongoDB database

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System Maintenance

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Regular Maintenance Tasks

# Update package lists
sudo apt update

# Upgrade installed packages
sudo apt upgrade

# Remove unused packages
sudo apt autoremove

# Clean package cache
sudo apt clean

# Check disk space
df -h

# Monitor system resources
htop

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Automated Cleanup

# Remove old journal logs (keep 7 days)
sudo journalctl --vacuum-time=7d

# Clean thumbnail cache
rm -rf ~/.cache/thumbnails/*

# Remove old kernels (keep current)
sudo apt autoremove --purge

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Performance Optimization Tips

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Memory Management

• Monitor memory usage with htop
• Identify memory-intensive processes
• Close unnecessary applications
• Use swap space judiciously

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Disk Optimization

• Regularly check disk usage with ncdu
• Remove old log files and caches
• Use compression for large files
• Archive or delete unused projects

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Process Optimization

• Kill zombie processes
• Limit background processes
• Use nice/renice for process priorities
• Monitor CPU usage patterns

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Troubleshooting Common Issues

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High CPU Usage

1. Launch htop to identify the process
2. Press F6 and sort by CPU%
3. Investigate or kill resource-intensive processes
4. Check for runaway processes

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Disk Full Error

1. Check disk usage with df -h
2. Use ncdu to find large directories
3. Clean package cache: sudo apt clean
4. Remove old logs: sudo journalctl --vacuum-time=7d
5. Delete unnecessary files

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Port Already in Use

1. Find process: sudo lsof -i:PORT
2. Kill process: sudo kill -9 PID
3. Or use: sudo fuser -k PORT/tcp
4. Verify port is free: sudo lsof -i:PORT

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Terminal Performance Issues

1. Check Oh My Zsh plugin count (too many can slow startup)
2. Disable unnecessary plugins
3. Use lighter terminal theme
4. Clear shell history if too large

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Best Practices

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Daily Workflow

• Use tmux for organizing development sessions
• Monitor resources with htop when system feels slow
• Check disk space weekly with ncdu
• Keep terminal organized with Zsh aliases

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Maintenance Schedule

• Daily: Monitor system resources during development
• Weekly: Check disk usage and clean up if needed
• Monthly: Update system packages and remove old files
• Quarterly: Review installed tools and remove unused ones

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Configuration Management

• Back up your .zshrc and .tmux.conf files
• Version control your dotfiles with Git
• Document custom configurations
• Test changes before committing

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Next Steps

• Custom Zsh themes and plugins
• Advanced tmux configurations
• Shell scripting for automation
• System monitoring with htop scripts
• Automated maintenance tasks

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Related Resources