====== Nome do host ======
<code bash>
# hostname 
security
</code>

**Para a versão de Debian a partir do 8 e CentOS a partir do 7:**
<code bash>
# hostnamectl status
   Static hostname: localhost.localdomain
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 8f52f125c0a14247b37c5509f0d576c0
           Boot ID: 87e297a8a8e9467583c3a45d9a4d2c55
    Virtualization: oracle
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-123.el7.x86_64
      Architecture: x86_64
</code>