These Linux commands helped me most in last 13 years of IT career Daily stuff: • ps aux | grep {process} - Find that sneaky process • lsof -i :{port} - Who's hogging that port? • df -h - The classic "we're out of space" checker • netstat -tulpn - Network connection detective • kubectl get pods | grep -i error - K8s trouble finder Log related commands: • tail -f /var/log/* - Real-time log watcher • journalctl -fu service-name - SystemD log stalker • grep -r "error" . - The error hunter • zcat access.log.gz | grep "500" - Compressed log ninja • less +F - The better tail command Container cli: • docker ps --format '{{.Names}} {{.Status}}' - Clean status check • docker stats --no-stream - Quick resource check • crictl logs {container} - Raw container stories • docker exec -it - The container backdoor • podman top - Process peek inside containers System Detectives: • htop - System resource storyteller • iostat -xz 1 - Disk performance poet • free -h - Memory mystery solver • vmstat 1 - System vital signs • dmesg -T | tail - Kernel's recent gossip Network stuff: • curl -v - HTTP conversation debugger • dig +short - Quick DNS lookup • ss -tunlp - Socket statistics simplified • iptables -L - Firewall rule reader • traceroute - Path finder File and stuff: • find . -name "*.yaml" -type f - YAML hunter • rsync -avz - Better file copier • tar -xvf - The unzipper (yes, we all google this) • ln -s - Symlink wizard • chmod +x - Make it executable Performance: • strace -p {pid} - System call spy • tcpdump -i any - Network packet sniffer • sar -n DEV 1 - Network stats watch • uptime - Load average at a glance • top -c - Classic process viewer Git Essentials: • git log --oneline - History simplified • git reset --hard HEAD^ - The "oops" eraser • git stash - The work hider • git diff --cached - What's staged? • git blame - The "who did this?" resolver Quick Fixes: • sudo !! - Run last command with sudo • ctrl+r - Command history search • history | grep - Command time machine • alias - Command shortcut maker • watch - Command repeater