例如：

$global:ERRORS = @();
 $global:PROGERR = @();

 function test(){
      # Can we redirect errors to $PROGERR here,leaving stdout for $OUTPUT?
      $OUTPUT = (& myprogram.exe 'argv[0]','argv[1]');

      if ( $OUTPUT | select-string -Pattern "foo" ) {
           # do stuff
      } else {
           $global:ERRORS += "test(): oh noes! 'foo' missing!";
      }
 }

 test;
 if ( @($global:ERRORS).length -gt 0 ) {
      Write-Host "Script specific error occurred";
      foreach ( $err in $global:ERRORS ) {
           $host.ui.WriteErrorLine("err: $err");
      }
 } else {
      Write-Host "Script ran fine!";
 }

 if ( @($global:PROGERR).length -gt 0 ) {
      # do stuff
 } else {
      Write-Host "External program ran fine!";
 }

一个沉闷的例子，但我想知道是否可能？