From LedHed's Wiki
Overview
Sometimes Linux Admins have to do stuff on Windows, and you curse Microsoft because they don't have Grep and Tail. Well PowerShell gives you similar functionality (albeit more complicated/less intuitive).
Command
Get-Content -Path c:\Windows\debug\netlogon.log -Tail 1 -Wait | Select-String "SomeUser" > c:\temp\someuser_netlogon.txt
Translation:
tail -f /windows/debug/netlogon.log | grep SomeUser > /tmp/SomeUser_netlogon.txt
Enjoy!