Useful Commands
hostnamectl set-hostname "aws-webmin.rhomicom.com"
nano /etc/hosts
kill SIGNAL PID
kill -9 2117
sudo netstat -tulpn | grep LISTEN
sudo ss -tulpn | grep LISTEN
fuser -k 25/tcp
fuser -k 80/tcp
fuser -k 443/tcp
su - zimbra -c "zmcontrol start"
systemctl stop named
systemctl disable named
su - zimbra -c "zmcontrol restart"
nc mail.rhomicom.com 25
nc mail.rhomicom.com 587
telnet mail.rhomicom.com 25
telnet mail.rhomicom.com 587
lsblk -o name,rota
fdisk -l
du -s -B1 -h -c --apparent-size *
du -csh *
## Extend Linux Partition ##
df -hT
sudo lsblk
sudo growpart /dev/nvme0n1 1
sudo lsblk
df -hT
sudo xfs_growfs -d /
df -hT
df -h
adduser rhouser
passwd rhouser
usermod -aG wheel rhouser
su - rhouser
userdel rhouser
userdel -r rhouser #del home dir
chkconfig --add httpd
chkconfig httpd on
chkconfig