Some common tasks in Windows PowerShell

suppress output of Cmdlets (e.g. new-item): pipe to out-null

suppress error output of binaries: svn log 2> $null

suppress error messages (even those that won't go away with -ea 0): $ErrorActionPreference = "silentlycontinue"

check if an error occured (e.g. after cmdlet with suppressed output): if (!$?)

copy-item throws an UnauthorizedAccessException: use parameter -force

RegEx:

$m = [regex]::matches("test", "([a-z]+)");
if ($m[0].Success)
{
  $str = $m[0].Groups[1].ToString();
}

get name and path of the currently running script:

$scriptName = $MyInvocation.MyCommand.Name;
$scriptPath = split-path $MyInvocation.MyCommand.Path;