Getting the Computer Name, Domain, more using powershell

a. gc env:Computername
    $computer = get-content env:ComputerName
Use the WMI objects to get computer name and other details
$Computer = Get-WmiObject -Class Win32_ComputerSystem -ComputerName $computer -namespace “rootCIMV2”
for Machine domain: $computer.Domain
# Print Computer Name 
“Computer Name is: {0}” -f $Computer.Name 
If you want to get the User Domain, you can run
   gc env:UserDNSDomain  – Fully quslified Domain name
    or gc env:UserDomain  – short domain
   [
     %COMPUTERNAME% for comuter name
     %USERDNSDOMAIN for full qualified User Domain
     %USERDOMAIN%  for short domain
   ]
Note: To display all the environment variables of particular instance
Run set in the command prompt
    >set
Similarly, you can run
   >dir env: | sort Name