Useful command for preventive maintenance
| Restart CentOs Desktop Service | systemctl restart gdm.service |
| Check HDD info in human readable format | df -lh |
| Restart specific service | systemctl restart [service_name] |
| List all services | systemctl |
| Check specific service status | systemctl status [service_name] |
| Check CentOS Version | cat /etc/centos-release |
| Restart Network | systemctl restart network |
| Remove Package | yum remove [package_name] |
| Install Package | yum install [package_name] |
| Install Package (Local Source) -Recommended without Internet Connection | rpm- ivh [package_name] |
| Clear terminal screen | clear |
| View Network Adaptor | nmcli d |
| Network Manager | nmtui |
| Check Server Uptime | uptime |
| Check Server Last Reboot Time | last reboot |
| Telnet 443 | openssl s_client -connect ip-address:443 |