# cat /proc/version
Linux version 5.0.0-arch1-1-ARCH (builduser@heftig-18825) (gcc version 8.2.1 20181127 (GCC)) #1 SMP PREEMPT Mon Mar 4 14:11:43 UTC 2019

# hostnamectl
   Static hostname: localhost
Transient hostname: localhost.localdomain
         Icon name: computer-laptop
           Chassis: laptop
        Machine ID: 7e0a101cd2f0406497a6e4354fc9b3b7
           Boot ID: a1424a0995da4e84b1e55b7f79df957e
  Operating System: Arch Linux
            Kernel: Linux 5.0.0-arch1-1-ARCH
      Architecture: x86-64

# hostnamectl
   Static hostname: localhost
Transient hostname: localhost.localdomain
         Icon name: computer-laptop
           Chassis: laptop
        Machine ID: 7e0a101cd2f0406497a6e4354fc9b3b7
           Boot ID: a1424a0995da4e84b1e55b7f79df957e
  Operating System: Arch Linux
            Kernel: Linux 5.0.0-arch1-1-ARCH
      Architecture: x86-64

$ gvim
Invalid MIT-MAGIC-COOKIE-1 keyE233: cannot open display

request subnet-mask, broadcast-address, time-offset, routers,
    domain-name, domain-name-servers, domain-search, host-name,
    dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
    netbios-name-servers, netbios-scope, interface-mtu,
    rfc3442-classless-static-routes, ntp-servers;