Welcome to LeviFREE's Blog

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# Move around
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cd /var/log          # Absolute path
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cd ../               # Go up one level
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cd -                 # Go to previous directory
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cd ~                 # Go home
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# List files
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ls -la               # Long format with hidden files
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ls -lhS              # Sort by size, human-readable
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tree -L 2            # Tree view, 2 levels deep

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# Copy, move, remove
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cp -r src/ backup/   # Copy directory recursively
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mv old.txt new.txt   # Rename / move
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rm -rf node_modules/ # Remove recursively (⚠️ careful)
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# Create
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mkdir -p a/b/c       # Create nested directories
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touch file.txt       # Create empty file

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ps aux | grep node               # Find processes
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top                              # Interactive process viewer
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htop                             # Better interactive viewer
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kill PID                         # Graceful termination
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kill -9 PID                      # Force kill
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# Background jobs
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long-running-command &           # Run in background
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nohup ./script.sh &              # Survive terminal close
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jobs                             # List background jobs

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df -h                # Disk space (human-readable)
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du -sh */            # Directory sizes
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free -h              # Memory usage

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curl -s https://api.example.com | jq .    # Fetch + pretty JSON
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wget -O file.zip https://example.com/f.zip  # Download file
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ss -tulnp                                   # Open ports
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ping -c 4 google.com                        # Connectivity check

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# Find large files
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find / -type f -size +100M 2>/dev/null
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# Watch a log in real time
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tail -f /var/log/syslog | grep --color error
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# Count lines of code
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find src -name "*.ts" | xargs wc -l | tail -1
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# Quick HTTP server
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python3 -m http.server 8080