# Find files (my #1 most used command) find . -name "*.js" # By name find . -name "*.js" -mtime -7 # Modified in last 7 days find . -size +100M # Larger than 100MB find . -type d -name "node_modules" # Directories only # Search file CONTENTS (faster than find + grep) grep -r "TODO" src/ # Recursive search grep -r "TODO" src/ --include="*.js" # In specific files grep -rn "function" src/ # With line numbers (-n) grep -ri "error" logs/ # Case insensitive (-i) rg "TODO" src/ # ripgrep (faster, use this instead!) # Quick file preview head -20 app.log # First 20 lines tail -f app.log # Follow live log (essential!) tail -100 app.log # Last 100 lines wc -l *.js # Line count of files cat config.json | python3 -m json.tool # Pretty-print JSON # File management cp important.txt important.txt.bak # ALWAYS backup before editing mv old-name new-name # Rename/move rm -rf node_modules # Remove directory (use carefully!) touch new-file.js # Create empty file ln -s /path/to/target symlink # Symbolic link # Find files (my #1 most used command) find . -name "*.js" # By name find . -name "*.js" -mtime -7 # Modified in last 7 days find . -size +100M # Larger than 100MB find . -type d -name "node_modules" # Directories only # Search file CONTENTS (faster than find + grep) grep -r "TODO" src/ # Recursive search grep -r "TODO" src/ --include="*.js" # In specific files grep -rn "function" src/ # With line numbers (-n) grep -ri "error" logs/ # Case insensitive (-i) rg "TODO" src/ # ripgrep (faster, use this instead!) # Quick file preview head -20 app.log # First 20 lines tail -f app.log # Follow live log (essential!) tail -100 app.log # Last 100 lines wc -l *.js # Line count of files cat config.json | python3 -m json.tool # Pretty-print JSON # File management cp important.txt important.txt.bak # ALWAYS backup before editing mv old-name new-name # Rename/move rm -rf node_modules # Remove directory (use carefully!) touch new-file.js # Create empty file ln -s /path/to/target symlink # Symbolic link # Find files (my #1 most used command) find . -name "*.js" # By name find . -name "*.js" -mtime -7 # Modified in last 7 days find . -size +100M # Larger than 100MB find . -type d -name "node_modules" # Directories only # Search file CONTENTS (faster than find + grep) grep -r "TODO" src/ # Recursive search grep -r "TODO" src/ --include="*.js" # In specific files grep -rn "function" src/ # With line numbers (-n) grep -ri "error" logs/ # Case insensitive (-i) rg "TODO" src/ # ripgrep (faster, use this instead!) # Quick file preview head -20 app.log # First 20 lines tail -f app.log # Follow live log (essential!) tail -100 app.log # Last 100 lines wc -l *.js # Line count of files cat config.json | python3 -m json.tool # Pretty-print JSON # File management cp important.txt important.txt.bak # ALWAYS backup before editing mv old-name new-name # Rename/move rm -rf node_modules # Remove directory (use carefully!) touch new-file.js # Create empty file ln -s /path/to/target symlink # Symbolic link # What's running? ps aux | grep node # Find Node processes top # Interactive process viewer htop # Better top (-weight: 500;">install it!) # Kill processes kill 12345 # Graceful shutdown (SIGTERM) kill -9 12345 # Force kill (SIGKILL) — when stuck pkill -f "node server.js" # Kill by name pattern killall node # Kill all processes named 'node' # Background & foreground -weight: 500;">npm -weight: 500;">start & # Run in background jobs # List background jobs fg %1 # Bring job 1 to foreground Ctrl+z # Suspend current process bg %1 # Resume suspended in background # Resource usage free -h # Memory usage df -h # Disk usage du -sh * # Directory sizes (finds space hogs!) du -sh node_modules/ # How big is this thing? du -h --max-depth=1 | sort -hr # Sorted by size, best for cleanup! lsof -i :3000 # What's using port 3000? ss -tlnp # All listening ports # What's running? ps aux | grep node # Find Node processes top # Interactive process viewer htop # Better top (-weight: 500;">install it!) # Kill processes kill 12345 # Graceful shutdown (SIGTERM) kill -9 12345 # Force kill (SIGKILL) — when stuck pkill -f "node server.js" # Kill by name pattern killall node # Kill all processes named 'node' # Background & foreground -weight: 500;">npm -weight: 500;">start & # Run in background jobs # List background jobs fg %1 # Bring job 1 to foreground Ctrl+z # Suspend current process bg %1 # Resume suspended in background # Resource usage free -h # Memory usage df -h # Disk usage du -sh * # Directory sizes (finds space hogs!) du -sh node_modules/ # How big is this thing? du -h --max-depth=1 | sort -hr # Sorted by size, best for cleanup! lsof -i :3000 # What's using port 3000? ss -tlnp # All listening ports # What's running? ps aux | grep node # Find Node processes top # Interactive process viewer htop # Better top (-weight: 500;">install it!) # Kill processes kill 12345 # Graceful shutdown (SIGTERM) kill -9 12345 # Force kill (SIGKILL) — when stuck pkill -f "node server.js" # Kill by name pattern killall node # Kill all processes named 'node' # Background & foreground -weight: 500;">npm -weight: 500;">start & # Run in background jobs # List background jobs fg %1 # Bring job 1 to foreground Ctrl+z # Suspend current process bg %1 # Resume suspended in background # Resource usage free -h # Memory usage df -h # Disk usage du -sh * # Directory sizes (finds space hogs!) du -sh node_modules/ # How big is this thing? du -h --max-depth=1 | sort -hr # Sorted by size, best for cleanup! lsof -i :3000 # What's using port 3000? ss -tlnp # All listening ports # Connection testing -weight: 500;">curl -I https://example.com # Headers only (quick check) -weight: 500;">curl -v https://api.example.com/users # Verbose (debug API calls) -weight: 500;">curl -X POST -H "Content-Type: application/json" \ -d '{"name":"test"}' https://api.example.com/users -weight: 500;">wget https://example.com/file.zip # Download file # DNS & network info dig example.com # DNS lookup nslookup example.com # Alternative DNS lookup ping google.com # Basic connectivity -weight: 500;">curl ifconfig.me # Your public IP ip addr show # Network interfaces # Port scanning (is a -weight: 500;">service running?) nc -zv localhost 3000 # Test if port 3000 is open ssh user@host "nc -zv localhost 22" # Remote port test # Connection testing -weight: 500;">curl -I https://example.com # Headers only (quick check) -weight: 500;">curl -v https://api.example.com/users # Verbose (debug API calls) -weight: 500;">curl -X POST -H "Content-Type: application/json" \ -d '{"name":"test"}' https://api.example.com/users -weight: 500;">wget https://example.com/file.zip # Download file # DNS & network info dig example.com # DNS lookup nslookup example.com # Alternative DNS lookup ping google.com # Basic connectivity -weight: 500;">curl ifconfig.me # Your public IP ip addr show # Network interfaces # Port scanning (is a -weight: 500;">service running?) nc -zv localhost 3000 # Test if port 3000 is open ssh user@host "nc -zv localhost 22" # Remote port test # Connection testing -weight: 500;">curl -I https://example.com # Headers only (quick check) -weight: 500;">curl -v https://api.example.com/users # Verbose (debug API calls) -weight: 500;">curl -X POST -H "Content-Type: application/json" \ -d '{"name":"test"}' https://api.example.com/users -weight: 500;">wget https://example.com/file.zip # Download file # DNS & network info dig example.com # DNS lookup nslookup example.com # Alternative DNS lookup ping google.com # Basic connectivity -weight: 500;">curl ifconfig.me # Your public IP ip addr show # Network interfaces # Port scanning (is a -weight: 500;">service running?) nc -zv localhost 3000 # Test if port 3000 is open ssh user@host "nc -zv localhost 22" # Remote port test # sed — stream editor (find & replace in files) sed -i 's/old/new/g' file.txt # Replace all occurrences sed -i 's/old/new/g' *.js # Replace in all JS files sed -n '10,20p' file.txt # Print lines 10-20 sed '/^$/d' file.txt # Remove empty lines # awk — text processing language awk '{print $1}' access.log # Print first column awk '{sum+=$NF} END {print sum}' data.txt # Sum last column awk -F',' '{print $1, $3}' csv.csv # CSV parsing (comma delimiter) # sort — organize lines sort names.txt # Alphabetical sort -r names.txt # Reverse sort -n numbers.txt # Numerical sort -k2 -n data.txt # Sort by 2nd column numerically sort -u names.txt # Unique only (-weight: 500;">remove duplicates) # uniq — deduplicate (must be sorted first) sort file.txt | uniq # Remove adjacent duplicates sort file.txt | uniq -c # Count occurrences sort file.txt | uniq -c | sort -rn # Most common first # The classic pipeline: count requests by IP in access log awk '{print $1}' access.log | sort | uniq -c | sort -rn | head -10 # xargs — build commands from input find . -name "*.log" | xargs rm # Delete all found files find . -name "*.js" | xargs wc -l # Line count all JS files echo "file1 file2 file3" | xargs -n 1 cp backup/ # Copy each to backup/ # tee — split output (to file AND screen) cat largefile.json | tee output.log | jq '.data' -weight: 500;">npm run build 2>&1 | tee build.log # Save and see build output # sed — stream editor (find & replace in files) sed -i 's/old/new/g' file.txt # Replace all occurrences sed -i 's/old/new/g' *.js # Replace in all JS files sed -n '10,20p' file.txt # Print lines 10-20 sed '/^$/d' file.txt # Remove empty lines # awk — text processing language awk '{print $1}' access.log # Print first column awk '{sum+=$NF} END {print sum}' data.txt # Sum last column awk -F',' '{print $1, $3}' csv.csv # CSV parsing (comma delimiter) # sort — organize lines sort names.txt # Alphabetical sort -r names.txt # Reverse sort -n numbers.txt # Numerical sort -k2 -n data.txt # Sort by 2nd column numerically sort -u names.txt # Unique only (-weight: 500;">remove duplicates) # uniq — deduplicate (must be sorted first) sort file.txt | uniq # Remove adjacent duplicates sort file.txt | uniq -c # Count occurrences sort file.txt | uniq -c | sort -rn # Most common first # The classic pipeline: count requests by IP in access log awk '{print $1}' access.log | sort | uniq -c | sort -rn | head -10 # xargs — build commands from input find . -name "*.log" | xargs rm # Delete all found files find . -name "*.js" | xargs wc -l # Line count all JS files echo "file1 file2 file3" | xargs -n 1 cp backup/ # Copy each to backup/ # tee — split output (to file AND screen) cat largefile.json | tee output.log | jq '.data' -weight: 500;">npm run build 2>&1 | tee build.log # Save and see build output # sed — stream editor (find & replace in files) sed -i 's/old/new/g' file.txt # Replace all occurrences sed -i 's/old/new/g' *.js # Replace in all JS files sed -n '10,20p' file.txt # Print lines 10-20 sed '/^$/d' file.txt # Remove empty lines # awk — text processing language awk '{print $1}' access.log # Print first column awk '{sum+=$NF} END {print sum}' data.txt # Sum last column awk -F',' '{print $1, $3}' csv.csv # CSV parsing (comma delimiter) # sort — organize lines sort names.txt # Alphabetical sort -r names.txt # Reverse sort -n numbers.txt # Numerical sort -k2 -n data.txt # Sort by 2nd column numerically sort -u names.txt # Unique only (-weight: 500;">remove duplicates) # uniq — deduplicate (must be sorted first) sort file.txt | uniq # Remove adjacent duplicates sort file.txt | uniq -c # Count occurrences sort file.txt | uniq -c | sort -rn # Most common first # The classic pipeline: count requests by IP in access log awk '{print $1}' access.log | sort | uniq -c | sort -rn | head -10 # xargs — build commands from input find . -name "*.log" | xargs rm # Delete all found files find . -name "*.js" | xargs wc -l # Line count all JS files echo "file1 file2 file3" | xargs -n 1 cp backup/ # Copy each to backup/ # tee — split output (to file AND screen) cat largefile.json | tee output.log | jq '.data' -weight: 500;">npm run build 2>&1 | tee build.log # Save and see build output # Real-time monitoring watch -n 5 'free -h' # Refresh every 5 seconds tail -f /var/log/syslog # Live log follow journalctl -u nginx -f # Follow systemd -weight: 500;">service logs # Disk space cleanup du -h --max-depth=2 / | sort -rh | head -20 # Top 20 disk consumers ncdu / # Interactive disk usage (amazing tool!) # Memory analysis free -h # Overview cat /proc/meminfo # Detailed ps aux --sort=-%mem | head -10 # Top memory consumers # CPU analysis uptime # Load average (1min, 5min, 15min) mpstat -P ALL # Per-CPU stats ps aux --sort=-%cpu | head -10 # Top CPU consumers # Service management -weight: 500;">systemctl -weight: 500;">status nginx # Check -weight: 500;">service -weight: 500;">status -weight: 500;">systemctl -weight: 500;">restart nginx # Restart -weight: 500;">systemctl -weight: 500;">enable myapp # Start on boot journalctl -u myapp -n 50 # Last 50 lines of -weight: 500;">service logs # Real-time monitoring watch -n 5 'free -h' # Refresh every 5 seconds tail -f /var/log/syslog # Live log follow journalctl -u nginx -f # Follow systemd -weight: 500;">service logs # Disk space cleanup du -h --max-depth=2 / | sort -rh | head -20 # Top 20 disk consumers ncdu / # Interactive disk usage (amazing tool!) # Memory analysis free -h # Overview cat /proc/meminfo # Detailed ps aux --sort=-%mem | head -10 # Top memory consumers # CPU analysis uptime # Load average (1min, 5min, 15min) mpstat -P ALL # Per-CPU stats ps aux --sort=-%cpu | head -10 # Top CPU consumers # Service management -weight: 500;">systemctl -weight: 500;">status nginx # Check -weight: 500;">service -weight: 500;">status -weight: 500;">systemctl -weight: 500;">restart nginx # Restart -weight: 500;">systemctl -weight: 500;">enable myapp # Start on boot journalctl -u myapp -n 50 # Last 50 lines of -weight: 500;">service logs # Real-time monitoring watch -n 5 'free -h' # Refresh every 5 seconds tail -f /var/log/syslog # Live log follow journalctl -u nginx -f # Follow systemd -weight: 500;">service logs # Disk space cleanup du -h --max-depth=2 / | sort -rh | head -20 # Top 20 disk consumers ncdu / # Interactive disk usage (amazing tool!) # Memory analysis free -h # Overview cat /proc/meminfo # Detailed ps aux --sort=-%mem | head -10 # Top memory consumers # CPU analysis uptime # Load average (1min, 5min, 15min) mpstat -P ALL # Per-CPU stats ps aux --sort=-%cpu | head -10 # Top CPU consumers # Service management -weight: 500;">systemctl -weight: 500;">status nginx # Check -weight: 500;">service -weight: 500;">status -weight: 500;">systemctl -weight: 500;">restart nginx # Restart -weight: 500;">systemctl -weight: 500;">enable myapp # Start on boot journalctl -u myapp -n 50 # Last 50 lines of -weight: 500;">service logs # Connect ssh user@hostname ssh user@hostname -p 2222 # Custom port ssh -i ~/.ssh/key.pem user@host # Specific key # Copy files (SCP) scp file.txt user@host:/path/to/ scp -r folder/ user@host:/path/to/ # Directory copy scp user@host:/path/to/file ./ # Download # Better alternative: rsync (resumable, shows progress) rsync -avz source/ user@host:dest/ rsync -avz --progress big-file user@host:~/ rsync -avz --delete source/ dest/ # Mirror (deletes extra files in dest) # SSH tunneling (forward local port to remote) ssh -L 8080:localhost:3000 user@host # Access host's :3000 via your :8080 # Config shortcuts (~/.ssh/config) Host myserver HostName 192.168.1.100 User deployer IdentityFile ~/.ssh/id_rsa Port 2222 # Now just: ssh myserver # Connect ssh user@hostname ssh user@hostname -p 2222 # Custom port ssh -i ~/.ssh/key.pem user@host # Specific key # Copy files (SCP) scp file.txt user@host:/path/to/ scp -r folder/ user@host:/path/to/ # Directory copy scp user@host:/path/to/file ./ # Download # Better alternative: rsync (resumable, shows progress) rsync -avz source/ user@host:dest/ rsync -avz --progress big-file user@host:~/ rsync -avz --delete source/ dest/ # Mirror (deletes extra files in dest) # SSH tunneling (forward local port to remote) ssh -L 8080:localhost:3000 user@host # Access host's :3000 via your :8080 # Config shortcuts (~/.ssh/config) Host myserver HostName 192.168.1.100 User deployer IdentityFile ~/.ssh/id_rsa Port 2222 # Now just: ssh myserver # Connect ssh user@hostname ssh user@hostname -p 2222 # Custom port ssh -i ~/.ssh/key.pem user@host # Specific key # Copy files (SCP) scp file.txt user@host:/path/to/ scp -r folder/ user@host:/path/to/ # Directory copy scp user@host:/path/to/file ./ # Download # Better alternative: rsync (resumable, shows progress) rsync -avz source/ user@host:dest/ rsync -avz --progress big-file user@host:~/ rsync -avz --delete source/ dest/ # Mirror (deletes extra files in dest) # SSH tunneling (forward local port to remote) ssh -L 8080:localhost:3000 user@host # Access host's :3000 via your :8080 # Config shortcuts (~/.ssh/config) Host myserver HostName 192.168.1.100 User deployer IdentityFile ~/.ssh/id_rsa Port 2222 # Now just: ssh myserver -weight: 500;">git -weight: 500;">status # Always first -weight: 500;">git diff # What changed? -weight: 500;">git add -A && -weight: 500;">git commit -m "message" # Stage + commit -weight: 500;">git push origin main # Push -weight: 500;">git pull --rebase origin main # Pull cleanly -weight: 500;">git log --oneline -10 # Recent history -weight: 500;">git stash && -weight: 500;">git stash pop # Temporarily save work -weight: 500;">git checkout -b feature/name # New branch -weight: 500;">git -weight: 500;">status # Always first -weight: 500;">git diff # What changed? -weight: 500;">git add -A && -weight: 500;">git commit -m "message" # Stage + commit -weight: 500;">git push origin main # Push -weight: 500;">git pull --rebase origin main # Pull cleanly -weight: 500;">git log --oneline -10 # Recent history -weight: 500;">git stash && -weight: 500;">git stash pop # Temporarily save work -weight: 500;">git checkout -b feature/name # New branch -weight: 500;">git -weight: 500;">status # Always first -weight: 500;">git diff # What changed? -weight: 500;">git add -A && -weight: 500;">git commit -m "message" # Stage + commit -weight: 500;">git push origin main # Push -weight: 500;">git pull --rebase origin main # Pull cleanly -weight: 500;">git log --oneline -10 # Recent history -weight: 500;">git stash && -weight: 500;">git stash pop # Temporarily save work -weight: 500;">git checkout -b feature/name # New branch # Add these to ~/.bashrc or ~/.zshrc alias ll='ls -lah' # Detailed listing alias gs='-weight: 500;">git -weight: 500;">status' # Quick -weight: 500;">git -weight: 500;">status alias gp='-weight: 500;">git pull --rebase origin main' alias ..='cd ..' # Go up one level alias ...='cd ../..' # Go up two levels alias ports='ss -tlnp' # Show listening ports alias myip='-weight: 500;">curl ifconfig.me' # Public IP alias cls='clear' # Clear terminal alias serve='python3 -m http.server 8000' # Quick HTTP server alias json='python3 -m json.tool' # Pretty JSON alias grep='grep --color=auto' # Colored grep alias df='df -h' # Human-readable disk alias du='du -sh' # Human-readable size alias mkdir='mkdir -pv' # Create parent dirs, verbose # Useful functions mkcd() { mkdir -p "$1" && cd "$1"; } # Create + enter directory extract() { # Extract any archive if [ -f "$1" ]; then case "$1" in *.tar.bz2) tar xjf "$1" ;; *.tar.gz) tar xzf "$1" ;; *.bz2) bunzip2 "$1" ;; *.rar) unrar x "$1" ;; *.gz) gunzip "$1" ;; *.tar) tar xf "$1" ;; *.tbz2) tar xjf "$1" ;; *.tgz) tar xzf "$1" ;; *.zip) unzip "$1" ;; *.Z) uncompress "$1" ;; *) echo "'$1' cannot be extracted" ;; esac fi } # Add these to ~/.bashrc or ~/.zshrc alias ll='ls -lah' # Detailed listing alias gs='-weight: 500;">git -weight: 500;">status' # Quick -weight: 500;">git -weight: 500;">status alias gp='-weight: 500;">git pull --rebase origin main' alias ..='cd ..' # Go up one level alias ...='cd ../..' # Go up two levels alias ports='ss -tlnp' # Show listening ports alias myip='-weight: 500;">curl ifconfig.me' # Public IP alias cls='clear' # Clear terminal alias serve='python3 -m http.server 8000' # Quick HTTP server alias json='python3 -m json.tool' # Pretty JSON alias grep='grep --color=auto' # Colored grep alias df='df -h' # Human-readable disk alias du='du -sh' # Human-readable size alias mkdir='mkdir -pv' # Create parent dirs, verbose # Useful functions mkcd() { mkdir -p "$1" && cd "$1"; } # Create + enter directory extract() { # Extract any archive if [ -f "$1" ]; then case "$1" in *.tar.bz2) tar xjf "$1" ;; *.tar.gz) tar xzf "$1" ;; *.bz2) bunzip2 "$1" ;; *.rar) unrar x "$1" ;; *.gz) gunzip "$1" ;; *.tar) tar xf "$1" ;; *.tbz2) tar xjf "$1" ;; *.tgz) tar xzf "$1" ;; *.zip) unzip "$1" ;; *.Z) uncompress "$1" ;; *) echo "'$1' cannot be extracted" ;; esac fi } # Add these to ~/.bashrc or ~/.zshrc alias ll='ls -lah' # Detailed listing alias gs='-weight: 500;">git -weight: 500;">status' # Quick -weight: 500;">git -weight: 500;">status alias gp='-weight: 500;">git pull --rebase origin main' alias ..='cd ..' # Go up one level alias ...='cd ../..' # Go up two levels alias ports='ss -tlnp' # Show listening ports alias myip='-weight: 500;">curl ifconfig.me' # Public IP alias cls='clear' # Clear terminal alias serve='python3 -m http.server 8000' # Quick HTTP server alias json='python3 -m json.tool' # Pretty JSON alias grep='grep --color=auto' # Colored grep alias df='df -h' # Human-readable disk alias du='du -sh' # Human-readable size alias mkdir='mkdir -pv' # Create parent dirs, verbose # Useful functions mkcd() { mkdir -p "$1" && cd "$1"; } # Create + enter directory extract() { # Extract any archive if [ -f "$1" ]; then case "$1" in *.tar.bz2) tar xjf "$1" ;; *.tar.gz) tar xzf "$1" ;; *.bz2) bunzip2 "$1" ;; *.rar) unrar x "$1" ;; *.gz) gunzip "$1" ;; *.tar) tar xf "$1" ;; *.tbz2) tar xjf "$1" ;; *.tgz) tar xzf "$1" ;; *.zip) unzip "$1" ;; *.Z) uncompress "$1" ;; *) echo "'$1' cannot be extracted" ;; esac fi }