Here are some really good and helpful PowerShell single line commands I have been using on my Windows Server 8 and Windows 8 machines.

Remove GUI from Windows Server 8

Remove-WindowsFeature -Name Server-Gui-Shell
Remove-WindowsFeature -Name Server-Gui-Mgmt-Infra

Add GUI to Windows Server 8

Install-WindowsFeature -Name Server-Gui-Shell

Get Volume details for a particular drive

Get-Volume -DriveLetter 'C'

Get all Volume details (including Free space)

Get-Volume

Optimize drive

Optimize-Volume -DriveLetter 'C'

Rename a Network Adapter

Rename-NetAdapter -Name 'External Interface' -NewName 'Internet Facing'

Disable IPv6

Set-NetAdapterBinding -Name "Internet Facing" -ComponentID ms_tcpip6 -Enabled $False

IPConfig equivalent

Get-NetIPConfiguration

IPConfig /all equivalent

Get-NetIPConfiguration -All

IPConfig /all equivalent and more..

Get-NetIPConfiguration -All -Detailed

Disable a Network Adapter

Disable-NetAdapter -Name "Internet Facing"

Configure a IPv4 IP Address

New-NetIPAddress -InterfaceIndex 21 -AddressFamily IPv4 -IPAddress 192.168.78.12

Add a computer to the domain (from client machine)

Add-Computer -Credential scrap\administrator -DomainName scrapping.local -ComputerName VIVEK-W8

Install Active Directory Domain Services and Active Directory Administrative Center

Install-WindowsFeature -Name AD-Domain-Services
Install-WindowsFeature -Name RSAT-AD-AdminCenter

I will keep updating the list as I come across the new ones..

Hope this helps,
Vivek Kumbhar