# Find large files (when disk is full) du -sh * | sort -rh | head -10 # Output: # 4.2G node_modules/ # 512M logs/ # 128M data.db # Find files modified in last N days find /var/log -mtime -7 -name "*.log" -ls # Quick file search fzf # Fuzzy finder — -weight: 500;">install it, thank me later locate "config.json" # Instant file search (updatedb runs daily) # Watch a file for changes (live log tailing) tail -f /var/log/nginx/error.log # With highlights: tail -f /var/log/app.log | grep --color=always -E "ERROR|WARN" # Compare two files diff -u file1.json file2.json sdiff -s file1 file2 # Side-by-side comparison # Find large files (when disk is full) du -sh * | sort -rh | head -10 # Output: # 4.2G node_modules/ # 512M logs/ # 128M data.db # Find files modified in last N days find /var/log -mtime -7 -name "*.log" -ls # Quick file search fzf # Fuzzy finder — -weight: 500;">install it, thank me later locate "config.json" # Instant file search (updatedb runs daily) # Watch a file for changes (live log tailing) tail -f /var/log/nginx/error.log # With highlights: tail -f /var/log/app.log | grep --color=always -E "ERROR|WARN" # Compare two files diff -u file1.json file2.json sdiff -s file1 file2 # Side-by-side comparison # Find large files (when disk is full) du -sh * | sort -rh | head -10 # Output: # 4.2G node_modules/ # 512M logs/ # 128M data.db # Find files modified in last N days find /var/log -mtime -7 -name "*.log" -ls # Quick file search fzf # Fuzzy finder — -weight: 500;">install it, thank me later locate "config.json" # Instant file search (updatedb runs daily) # Watch a file for changes (live log tailing) tail -f /var/log/nginx/error.log # With highlights: tail -f /var/log/app.log | grep --color=always -E "ERROR|WARN" # Compare two files diff -u file1.json file2.json sdiff -s file1 file2 # Side-by-side comparison # What's eating my CPU? htop # Better top (-weight: 500;">install it!) # Or: ps aux --sort=-%cpu | head -10 # What's eating my RAM? ps aux --sort=-%mem | head -10 free -h # Memory overview # Find process by port ss -tlnp | grep :3000 # Output: LISTEN 0 128 *:3000 users:(("node",pid=12345)) # Kill processes by name pkill -f "node server.js" kill $(lsof -ti:3000) # Kill whatever is on port 3000 # Process tree pstree -p # Shows parent-child relationships pgrep -a node # All Node.js processes with args # Background & foreground -weight: 500;">npm -weight: 500;">start & jobs # List background jobs fg %1 # Bring job 1 to foreground Ctrl+Z # Suspend current job bg %1 # Resume in background # nohup = survives terminal close nohup -weight: 500;">npm -weight: 500;">start > app.log 2>&1 & # What's eating my CPU? htop # Better top (-weight: 500;">install it!) # Or: ps aux --sort=-%cpu | head -10 # What's eating my RAM? ps aux --sort=-%mem | head -10 free -h # Memory overview # Find process by port ss -tlnp | grep :3000 # Output: LISTEN 0 128 *:3000 users:(("node",pid=12345)) # Kill processes by name pkill -f "node server.js" kill $(lsof -ti:3000) # Kill whatever is on port 3000 # Process tree pstree -p # Shows parent-child relationships pgrep -a node # All Node.js processes with args # Background & foreground -weight: 500;">npm -weight: 500;">start & jobs # List background jobs fg %1 # Bring job 1 to foreground Ctrl+Z # Suspend current job bg %1 # Resume in background # nohup = survives terminal close nohup -weight: 500;">npm -weight: 500;">start > app.log 2>&1 & # What's eating my CPU? htop # Better top (-weight: 500;">install it!) # Or: ps aux --sort=-%cpu | head -10 # What's eating my RAM? ps aux --sort=-%mem | head -10 free -h # Memory overview # Find process by port ss -tlnp | grep :3000 # Output: LISTEN 0 128 *:3000 users:(("node",pid=12345)) # Kill processes by name pkill -f "node server.js" kill $(lsof -ti:3000) # Kill whatever is on port 3000 # Process tree pstree -p # Shows parent-child relationships pgrep -a node # All Node.js processes with args # Background & foreground -weight: 500;">npm -weight: 500;">start & jobs # List background jobs fg %1 # Bring job 1 to foreground Ctrl+Z # Suspend current job bg %1 # Resume in background # nohup = survives terminal close nohup -weight: 500;">npm -weight: 500;">start > app.log 2>&1 & # Is the port open? -weight: 500;">curl -I http://localhost:3000 ss -tlnp | grep :3000 # DNS check dig example.com +short nslookup example.com # Connection test (is this host reachable?) ping -c 3 google.com nc -zv github.com 443 # Port scan single port nc -zv example.com 80-100 # Port range # HTTP debugging (see headers, redirects) -weight: 500;">curl -v https://api.example.com/data -weight: 500;">curl -I https://example.com # Headers only -weight: 500;">curl -sI -o /dev/null -w "%{http_code} %{time_total}s\n" URL # Status + time # Follow redirects -weight: 500;">curl -L https://bit.ly/something # POST request -weight: 500;">curl -X POST https://api.example.com/users \ -H "Content-Type: application/json" \ -d '{"name": "Alex"}' # Download file -weight: 500;">wget -q URL -O output.txt -weight: 500;">curl -sL URL -o output.txt # Network interfaces + IPs ip addr show hostname -I # Just IP addresses # Is the port open? -weight: 500;">curl -I http://localhost:3000 ss -tlnp | grep :3000 # DNS check dig example.com +short nslookup example.com # Connection test (is this host reachable?) ping -c 3 google.com nc -zv github.com 443 # Port scan single port nc -zv example.com 80-100 # Port range # HTTP debugging (see headers, redirects) -weight: 500;">curl -v https://api.example.com/data -weight: 500;">curl -I https://example.com # Headers only -weight: 500;">curl -sI -o /dev/null -w "%{http_code} %{time_total}s\n" URL # Status + time # Follow redirects -weight: 500;">curl -L https://bit.ly/something # POST request -weight: 500;">curl -X POST https://api.example.com/users \ -H "Content-Type: application/json" \ -d '{"name": "Alex"}' # Download file -weight: 500;">wget -q URL -O output.txt -weight: 500;">curl -sL URL -o output.txt # Network interfaces + IPs ip addr show hostname -I # Just IP addresses # Is the port open? -weight: 500;">curl -I http://localhost:3000 ss -tlnp | grep :3000 # DNS check dig example.com +short nslookup example.com # Connection test (is this host reachable?) ping -c 3 google.com nc -zv github.com 443 # Port scan single port nc -zv example.com 80-100 # Port range # HTTP debugging (see headers, redirects) -weight: 500;">curl -v https://api.example.com/data -weight: 500;">curl -I https://example.com # Headers only -weight: 500;">curl -sI -o /dev/null -w "%{http_code} %{time_total}s\n" URL # Status + time # Follow redirects -weight: 500;">curl -L https://bit.ly/something # POST request -weight: 500;">curl -X POST https://api.example.com/users \ -H "Content-Type: application/json" \ -d '{"name": "Alex"}' # Download file -weight: 500;">wget -q URL -O output.txt -weight: 500;">curl -sL URL -o output.txt # Network interfaces + IPs ip addr show hostname -I # Just IP addresses # Am I running out of space? df -h # Human-readable disk usage du -sh /* | sort -rh | head-10 # Biggest directories # Find large files (>100MB) find / -type f -size +100M -exec ls -lh {} \; 2>/dev/null | sort -k5 -rh # Clean up rm -rf node_modules/ # Obvious -weight: 500;">npm cache clean --force # Free up -weight: 500;">npm cache -weight: 500;">docker system prune -af # Docker cleanup (careful!) # Disk usage by type ncdu # Interactive disk usage explorer (amazing tool) # Inode check (lots of small files?) df -i # If %Used is 100%, you're out of inodes not space # Am I running out of space? df -h # Human-readable disk usage du -sh /* | sort -rh | head-10 # Biggest directories # Find large files (>100MB) find / -type f -size +100M -exec ls -lh {} \; 2>/dev/null | sort -k5 -rh # Clean up rm -rf node_modules/ # Obvious -weight: 500;">npm cache clean --force # Free up -weight: 500;">npm cache -weight: 500;">docker system prune -af # Docker cleanup (careful!) # Disk usage by type ncdu # Interactive disk usage explorer (amazing tool) # Inode check (lots of small files?) df -i # If %Used is 100%, you're out of inodes not space # Am I running out of space? df -h # Human-readable disk usage du -sh /* | sort -rh | head-10 # Biggest directories # Find large files (>100MB) find / -type f -size +100M -exec ls -lh {} \; 2>/dev/null | sort -k5 -rh # Clean up rm -rf node_modules/ # Obvious -weight: 500;">npm cache clean --force # Free up -weight: 500;">npm cache -weight: 500;">docker system prune -af # Docker cleanup (careful!) # Disk usage by type ncdu # Interactive disk usage explorer (amazing tool) # Inode check (lots of small files?) df -i # If %Used is 100%, you're out of inodes not space # Grep power user grep -r "TODO" src/ --include="*.ts" # Recursive, filtered grep -n "error" app.log | tail -20 # Line numbers grep -c "" file.txt # Count lines grep -E "(error|warn|fail)" log.txt # Regex OR grep -v "^#" config.ini # Exclude comments grep -A 5 -B 2 "exception" error.log # Context lines # Sed quick edits sed -i 's/old/new/g' file.txt # Replace all occurrences sed -i '42d' file.txt # Delete line 42 sed -n '10,20p' file.txt # Print lines 10-20 sed -i '1i\# Header' file.txt # Insert at line 1 # Awk for column processing awk '{print $1, $NF}' access.log # First + last column awk '{sum+=$NF} END {print sum}' nums.txt # Sum last column awk -F',' '{print $2}' csv.csv # CSV parsing awk 'length > 80' longlines.txt # Filter long lines # Sort & unique sort file.txt | uniq # Deduplicate sort -rn numbers.txt # Reverse numeric sort -k2 -t',' file.csv # Sort by column 2 # Quick JSON manipulation (with jq) cat data.json | jq '.users[].name' cat data.json | jq '.[] | select(.age > 30)' echo '{"key":"value"}' | jq '.key' # Extract value # Grep power user grep -r "TODO" src/ --include="*.ts" # Recursive, filtered grep -n "error" app.log | tail -20 # Line numbers grep -c "" file.txt # Count lines grep -E "(error|warn|fail)" log.txt # Regex OR grep -v "^#" config.ini # Exclude comments grep -A 5 -B 2 "exception" error.log # Context lines # Sed quick edits sed -i 's/old/new/g' file.txt # Replace all occurrences sed -i '42d' file.txt # Delete line 42 sed -n '10,20p' file.txt # Print lines 10-20 sed -i '1i\# Header' file.txt # Insert at line 1 # Awk for column processing awk '{print $1, $NF}' access.log # First + last column awk '{sum+=$NF} END {print sum}' nums.txt # Sum last column awk -F',' '{print $2}' csv.csv # CSV parsing awk 'length > 80' longlines.txt # Filter long lines # Sort & unique sort file.txt | uniq # Deduplicate sort -rn numbers.txt # Reverse numeric sort -k2 -t',' file.csv # Sort by column 2 # Quick JSON manipulation (with jq) cat data.json | jq '.users[].name' cat data.json | jq '.[] | select(.age > 30)' echo '{"key":"value"}' | jq '.key' # Extract value # Grep power user grep -r "TODO" src/ --include="*.ts" # Recursive, filtered grep -n "error" app.log | tail -20 # Line numbers grep -c "" file.txt # Count lines grep -E "(error|warn|fail)" log.txt # Regex OR grep -v "^#" config.ini # Exclude comments grep -A 5 -B 2 "exception" error.log # Context lines # Sed quick edits sed -i 's/old/new/g' file.txt # Replace all occurrences sed -i '42d' file.txt # Delete line 42 sed -n '10,20p' file.txt # Print lines 10-20 sed -i '1i\# Header' file.txt # Insert at line 1 # Awk for column processing awk '{print $1, $NF}' access.log # First + last column awk '{sum+=$NF} END {print sum}' nums.txt # Sum last column awk -F',' '{print $2}' csv.csv # CSV parsing awk 'length > 80' longlines.txt # Filter long lines # Sort & unique sort file.txt | uniq # Deduplicate sort -rn numbers.txt # Reverse numeric sort -k2 -t',' file.csv # Sort by column 2 # Quick JSON manipulation (with jq) cat data.json | jq '.users[].name' cat data.json | jq '.[] | select(.age > 30)' echo '{"key":"value"}' | jq '.key' # Extract value # Real-time monitoring htop # Processes (interactive) iotop # Disk I/O iftop # Network bandwidth nethogs # Network per-process # One-liner stats echo "=== CPU ===" && nproc && echo "=== RAM ===" && free -h | grep Mem && echo "=== Disk ===" && df -h / && echo "=== Uptime ===" && uptime # Last reboot who -b last reboot | head -5 # Current runlevel / systemd targets -weight: 500;">systemctl list-units --state=running --type=-weight: 500;">service # Journalctl (systemd logs) journalctl -u nginx -f # Follow nginx logs journalctl --since "1 hour ago" # Recent logs journalctl -p err # Only errors # Real-time monitoring htop # Processes (interactive) iotop # Disk I/O iftop # Network bandwidth nethogs # Network per-process # One-liner stats echo "=== CPU ===" && nproc && echo "=== RAM ===" && free -h | grep Mem && echo "=== Disk ===" && df -h / && echo "=== Uptime ===" && uptime # Last reboot who -b last reboot | head -5 # Current runlevel / systemd targets -weight: 500;">systemctl list-units --state=running --type=-weight: 500;">service # Journalctl (systemd logs) journalctl -u nginx -f # Follow nginx logs journalctl --since "1 hour ago" # Recent logs journalctl -p err # Only errors # Real-time monitoring htop # Processes (interactive) iotop # Disk I/O iftop # Network bandwidth nethogs # Network per-process # One-liner stats echo "=== CPU ===" && nproc && echo "=== RAM ===" && free -h | grep Mem && echo "=== Disk ===" && df -h / && echo "=== Uptime ===" && uptime # Last reboot who -b last reboot | head -5 # Current runlevel / systemd targets -weight: 500;">systemctl list-units --state=running --type=-weight: 500;">service # Journalctl (systemd logs) journalctl -u nginx -f # Follow nginx logs journalctl --since "1 hour ago" # Recent logs journalctl -p err # Only errors # Status super-view -weight: 500;">git -weight: 500;">status -sb # Short branch + -weight: 500;">status # What changed? -weight: 500;">git diff --stat # File summary -weight: 500;">git diff name-only # Just filenames # Who changed this? -weight: 500;">git blame file.ts -L 10,20 # Lines 10-20 only -weight: 500;">git log --oneline --author="Alex" # My commits # Undo mistakes -weight: 500;">git checkout -- file.ts # Discard changes to file -weight: 500;">git reset HEAD~1 # Undo last commit (keep changes) -weight: 500;">git commit --amend # Edit last commit message # Stash management -weight: 500;">git stash push -m "WIP feature X" -weight: 500;">git stash list -weight: 500;">git stash pop # Branch cleanup -weight: 500;">git branch -vv # Show tracking info -weight: 500;">git branch --merged | grep -v '\*' | xargs -weight: 500;">git branch -d # Delete merged branches # Status super-view -weight: 500;">git -weight: 500;">status -sb # Short branch + -weight: 500;">status # What changed? -weight: 500;">git diff --stat # File summary -weight: 500;">git diff name-only # Just filenames # Who changed this? -weight: 500;">git blame file.ts -L 10,20 # Lines 10-20 only -weight: 500;">git log --oneline --author="Alex" # My commits # Undo mistakes -weight: 500;">git checkout -- file.ts # Discard changes to file -weight: 500;">git reset HEAD~1 # Undo last commit (keep changes) -weight: 500;">git commit --amend # Edit last commit message # Stash management -weight: 500;">git stash push -m "WIP feature X" -weight: 500;">git stash list -weight: 500;">git stash pop # Branch cleanup -weight: 500;">git branch -vv # Show tracking info -weight: 500;">git branch --merged | grep -v '\*' | xargs -weight: 500;">git branch -d # Delete merged branches # Status super-view -weight: 500;">git -weight: 500;">status -sb # Short branch + -weight: 500;">status # What changed? -weight: 500;">git diff --stat # File summary -weight: 500;">git diff name-only # Just filenames # Who changed this? -weight: 500;">git blame file.ts -L 10,20 # Lines 10-20 only -weight: 500;">git log --oneline --author="Alex" # My commits # Undo mistakes -weight: 500;">git checkout -- file.ts # Discard changes to file -weight: 500;">git reset HEAD~1 # Undo last commit (keep changes) -weight: 500;">git commit --amend # Edit last commit message # Stash management -weight: 500;">git stash push -m "WIP feature X" -weight: 500;">git stash list -weight: 500;">git stash pop # Branch cleanup -weight: 500;">git branch -vv # Show tracking info -weight: 500;">git branch --merged | grep -v '\*' | xargs -weight: 500;">git branch -d # Delete merged branches # Quick connection ssh user@host "command" # Run command remotely # Copy files scp file.txt user@host:/path/ rsync -avz local/ user@host:/remote/ # Sync directories # SSH tunnel (access remote port locally) ssh -L 8080:localhost:3000 user@host # Now localhost:8080 → remote:3000 # Key-based auth (no passwords!) ssh-copy-id user@host # Copy your public key # Quick connection ssh user@host "command" # Run command remotely # Copy files scp file.txt user@host:/path/ rsync -avz local/ user@host:/remote/ # Sync directories # SSH tunnel (access remote port locally) ssh -L 8080:localhost:3000 user@host # Now localhost:8080 → remote:3000 # Key-based auth (no passwords!) ssh-copy-id user@host # Copy your public key # Quick connection ssh user@host "command" # Run command remotely # Copy files scp file.txt user@host:/path/ rsync -avz local/ user@host:/remote/ # Sync directories # SSH tunnel (access remote port locally) ssh -L 8080:localhost:3000 user@host # Now localhost:8080 → remote:3000 # Key-based auth (no passwords!) ssh-copy-id user@host # Copy your public key # Add these to ~/.bashrc alias ll='ls -alF' alias la='ls -A' alias l='ls -CF' alias ..='cd ..' alias ...='cd ../..' alias gs='-weight: 500;">git -weight: 500;">status -sb' alias gl='-weight: 500;">git log --oneline --graph -15' alias gp='-weight: 500;">git push' alias gd='-weight: 500;">git diff' alias gc='-weight: 500;">git checkout' alias nb='-weight: 500;">npm run build' alias ns='-weight: 500;">npm run -weight: 500;">start' alias nt='-weight: 500;">npm test' alias dc='-weight: 500;">docker compose' alias ports='ss -tlnp' alias myip='-weight: 500;">curl -s ifconfig.me' alias weather='-weight: 500;">curl -s wttr.in/?format=3' # Quick functions mkcd() { mkdir -p "$1" && cd "$1"; } extract() { if [ -f "$1" ]; then case "$1" in *.tar.gz) tar xzf "$1" ;; *.tar.xz) tar xJf "$1" ;; *.zip) unzip "$1" ;; *) echo "Unknown format";; esac fi } # Add these to ~/.bashrc alias ll='ls -alF' alias la='ls -A' alias l='ls -CF' alias ..='cd ..' alias ...='cd ../..' alias gs='-weight: 500;">git -weight: 500;">status -sb' alias gl='-weight: 500;">git log --oneline --graph -15' alias gp='-weight: 500;">git push' alias gd='-weight: 500;">git diff' alias gc='-weight: 500;">git checkout' alias nb='-weight: 500;">npm run build' alias ns='-weight: 500;">npm run -weight: 500;">start' alias nt='-weight: 500;">npm test' alias dc='-weight: 500;">docker compose' alias ports='ss -tlnp' alias myip='-weight: 500;">curl -s ifconfig.me' alias weather='-weight: 500;">curl -s wttr.in/?format=3' # Quick functions mkcd() { mkdir -p "$1" && cd "$1"; } extract() { if [ -f "$1" ]; then case "$1" in *.tar.gz) tar xzf "$1" ;; *.tar.xz) tar xJf "$1" ;; *.zip) unzip "$1" ;; *) echo "Unknown format";; esac fi } # Add these to ~/.bashrc alias ll='ls -alF' alias la='ls -A' alias l='ls -CF' alias ..='cd ..' alias ...='cd ../..' alias gs='-weight: 500;">git -weight: 500;">status -sb' alias gl='-weight: 500;">git log --oneline --graph -15' alias gp='-weight: 500;">git push' alias gd='-weight: 500;">git diff' alias gc='-weight: 500;">git checkout' alias nb='-weight: 500;">npm run build' alias ns='-weight: 500;">npm run -weight: 500;">start' alias nt='-weight: 500;">npm test' alias dc='-weight: 500;">docker compose' alias ports='ss -tlnp' alias myip='-weight: 500;">curl -s ifconfig.me' alias weather='-weight: 500;">curl -s wttr.in/?format=3' # Quick functions mkcd() { mkdir -p "$1" && cd "$1"; } extract() { if [ -f "$1" ]; then case "$1" in *.tar.gz) tar xzf "$1" ;; *.tar.xz) tar xJf "$1" ;; *.zip) unzip "$1" ;; *) echo "Unknown format";; esac fi } # My "server health check" one-liner echo "=== $(date) ===" && \ echo "Uptime: $(uptime -p)" && \ echo "CPU: $(top -bn1 | grep "Cpu(s)" | awk '{print $2}')" && \ echo "RAM: $(free -h | awk '/Mem:/{print $3"/"$2}') " && \ echo "Disk: $(df -h / | awk 'NR==2{print $3"/"$2" ("$5")"}')" && \ echo "Processes: $(ps aux | wc -l)" && \ echo "Node procs: $(pgrep -c node)" && \ echo "Ports: $(ss -tlnp | wc -l) listening" # My "server health check" one-liner echo "=== $(date) ===" && \ echo "Uptime: $(uptime -p)" && \ echo "CPU: $(top -bn1 | grep "Cpu(s)" | awk '{print $2}')" && \ echo "RAM: $(free -h | awk '/Mem:/{print $3"/"$2}') " && \ echo "Disk: $(df -h / | awk 'NR==2{print $3"/"$2" ("$5")"}')" && \ echo "Processes: $(ps aux | wc -l)" && \ echo "Node procs: $(pgrep -c node)" && \ echo "Ports: $(ss -tlnp | wc -l) listening" # My "server health check" one-liner echo "=== $(date) ===" && \ echo "Uptime: $(uptime -p)" && \ echo "CPU: $(top -bn1 | grep "Cpu(s)" | awk '{print $2}')" && \ echo "RAM: $(free -h | awk '/Mem:/{print $3"/"$2}') " && \ echo "Disk: $(df -h / | awk 'NR==2{print $3"/"$2" ("$5")"}')" && \ echo "Processes: $(ps aux | wc -l)" && \ echo "Node procs: $(pgrep -c node)" && \ echo "Ports: $(ss -tlnp | wc -l) listening" === Sat May 16 02:49:00 CST 2026 === Uptime: up 3 weeks, 2 days, 14 hours CPU: 2.3% RAM: 1.8G/3.7G (51%) Disk: 37G/59G (65%) Processes: 187 Node procs: 4 Ports: 12 listening === Sat May 16 02:49:00 CST 2026 === Uptime: up 3 weeks, 2 days, 14 hours CPU: 2.3% RAM: 1.8G/3.7G (51%) Disk: 37G/59G (65%) Processes: 187 Node procs: 4 Ports: 12 listening === Sat May 16 02:49:00 CST 2026 === Uptime: up 3 weeks, 2 days, 14 hours CPU: 2.3% RAM: 1.8G/3.7G (51%) Disk: 37G/59G (65%) Processes: 187 Node procs: 4 Ports: 12 listening