$username = 'myUsername'
$dn = (Get-ADUser $username).DistinguishedName
Get-ADGroup -LDAPFilter ("(member:1.2.840.113556.1.4.1941:={0})" -f $dn) | select -expand Name | sort Name

$objSID = New-Object System.Security.Principal.SecurityIdentifier("ENTER-SID-HERE") 
$objUser = $objSID.Translate( [System.Security.Principal.NTAccount] ) 
$objUser.Value

Follow

Get-Content -Patch "<fil>" -Wait

Standard tail, print 10 siste

Get-Content <fil> | Select-Object -Last <lines>

gps <string> | spps -Force
Get-Process -Name <string> | Stop-Process -Force

Invoke-Command -ComputerName <navn> -ScriptBlock { Get-WhatNot }

Get-ChildItem *.jpg | % { Rename-Item $_ $_.Name.Replace("gammelt_navn", "nytt_navn") }