Linux & Ubuntu Essential Commands Every Server Administrator Should Know

Learn the most useful Linux and Ubuntu commands for managing servers, monitoring resources, troubleshooting issues, securing systems, and running production workloads.

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In This Guide

✓ System Information

✓ File Management

✓ User Management

✓ Networking

✓ Package Management

✓ Process Monitoring

✓ Disk Usage

✓ Logs & Troubleshooting

✓ Security Commands

✓ SSH Commands

System Information

hostnamectl

uname -a

uptime

whoami

lscpu

free -m

File Management

ls -lah

pwd

mkdir myfolder

cp file.txt backup.txt

mv old.txt new.txt

rm -rf foldername

find / -name "*.log"

Package Management

sudo apt update

sudo apt upgrade -y

sudo apt install nginx

sudo apt remove nginx

apt list --installed

Process Monitoring

top

htop

ps aux

kill -9 PID

systemctl status nginx

Networking Commands

ip a

ping google.com

curl ifconfig.me

ss -tulpn

netstat -tulpn

traceroute google.com

Disk Usage

df -h

du -sh *

lsblk

fdisk -l

Logs & Troubleshooting

journalctl -xe

tail -f /var/log/syslog

dmesg

tail -100 /var/log/nginx/error.log

Security Commands

sudo ufw status

sudo ufw allow 22

sudo fail2ban-client status

last

sudo passwd username

SSH Commands

ssh user@server-ip

ssh-copy-id user@server-ip

scp file.txt user@server:/home/user

CloudRevol Linux Administration Tips

✓ Enable automatic security updates
✓ Configure UFW firewall
✓ Monitor server logs daily
✓ Use SSH keys instead of passwords
✓ Keep Ubuntu updated regularly
✓ Monitor disk usage frequently
✓ Backup critical data regularly