--- a/OSProcess.st	Tue Sep 03 18:56:50 2019 +0200
+++ b/OSProcess.st	Wed Sep 04 08:57:10 2019 +0200
@@ -6,9 +6,9 @@
 
 Object subclass:#OSProcess
 	instanceVariableNames:'pid command environment directory inStream outStream errorStream
-		auxStream showWindow lineWise newPgrp exitStatus finishSema
-		inputShufflerProcesses outputShufflerProcesses streamsToClose
-		terminateActionBlock'
+		auxInStream auxOutStream showWindow lineWise newPgrp exitStatus
+		finishSema inputShufflerProcesses outputShufflerProcesses
+		streamsToClose terminateActionBlock'
 	classVariableNames:'Instances'
 	poolDictionaries:''
 	category:'System-Support'
@@ -376,15 +376,43 @@
 
 !OSProcess methodsFor:'accessing'!
 
-auxStream
-    ^ auxStream
+auxInStream
+    ^ auxInStream
 !
 
-auxStream:something
+auxInStream:aStream
     "set an auxiliary input stream that will be available to the command as
      file descriptor 3"
 
-    auxStream := something.
+    auxInStream := aStream.
+
+    "Modified (comment): / 23-02-2017 / 10:56:57 / Maren"
+!
+
+auxOutStream
+    ^ auxOutStream
+!
+
+auxOutStream:aStream
+    "set an auxiliary output stream that will be available to the command as
+     file descriptor 4"
+
+    auxOutStream := aStream.
+
+    "Modified (comment): / 23-02-2017 / 10:56:57 / Maren"
+!
+
+auxStream
+    <resource: #obsolete>
+    ^ self auxInStream
+!
+
+auxStream:aStream
+    <resource: #obsolete>
+    "set an auxiliary input stream that will be available to the command as
+     file descriptor 3"
+
+    self auxInStream:aStream.
 
     "Modified (comment): / 23-02-2017 / 10:56:57 / Maren"
 !
@@ -437,7 +465,7 @@
     "Created: / 04-11-2018 / 18:28:24 / Claus Gittinger"
 !
 
-command:commandArg environment:environmentArg directory:directoryArg inStream:inStreamArg outStream:outStreamArg errorStream:errorStreamArg auxStream:auxStreamArg showWindow:showWindowArg lineWise:lineWiseArg 
+command:commandArg environment:environmentArg directory:directoryArg inStream:inStreamArg outStream:outStreamArg errorStream:errorStreamArg auxInStream:auxInStreamArg auxOutStream:auxOutStreamArg showWindow:showWindowArg lineWise:lineWiseArg 
     "set the command to be executed & directory, where to execute.
      and input/output streams.
      See comments in individual setters for more info"
@@ -448,7 +476,24 @@
     inStream := inStreamArg.
     outStream := outStreamArg.
     errorStream := errorStreamArg.
-    auxStream := auxStreamArg.
+    auxInStream := auxInStreamArg.
+    auxOutStream := auxOutStreamArg.
+    showWindow := showWindowArg.
+    lineWise := lineWiseArg.
+!
+
+command:commandArg environment:environmentArg directory:directoryArg inStream:inStreamArg outStream:outStreamArg errorStream:errorStreamArg auxStream:auxInStreamArg showWindow:showWindowArg lineWise:lineWiseArg 
+    "set the command to be executed & directory, where to execute.
+     and input/output streams.
+     See comments in individual setters for more info"
+
+    command := commandArg.
+    environment := environmentArg.
+    directory := directoryArg.
+    inStream := inStreamArg.
+    outStream := outStreamArg.
+    errorStream := errorStreamArg.
+    auxInStream := auxInStreamArg.
     showWindow := showWindowArg.
     lineWise := lineWiseArg.
 !
@@ -866,7 +911,7 @@
 
     procs := aProcessCollection.
     procs notNil ifTrue:[
-        procs do:[:eachProc | eachProc terminate].
+        procs copy do:[:eachProc | eachProc terminate].
         procs removeAll.
     ].
 
@@ -969,10 +1014,16 @@
            the exit fom the command interpreter/shell is done some time later
            So you have to check later or set #terminateActionBlock: and check there."
 
-    |externalInStream externalAuxStream externalErrorStream externalOutStream callingProcess|
+    |externalInStream externalAuxInStream externalErrorStream externalOutStream 
+     externalAuxOutStream callingProcess|
 
     externalInStream := self setupShufflerForInput:inStream.
-    externalAuxStream := self setupShufflerForInput:auxStream.
+    auxInStream notNil ifTrue:[
+        externalAuxInStream := self setupShufflerForInput:auxInStream.
+    ].
+    auxOutStream notNil ifTrue:[
+        externalAuxOutStream := self setupShufflerForOutput:auxOutStream.
+    ].
     externalOutStream := self setupShufflerForOutput:outStream.
 
     errorStream == outStream ifTrue:[
@@ -998,7 +1049,8 @@
                         inputFrom:externalInStream
                         outputTo:externalOutStream
                         errorTo:externalErrorStream
-                        auxFrom:externalAuxStream
+                        auxFrom:externalAuxInStream
+                        aux2To:externalAuxOutStream
                         environment:environment
                         inDirectory:directory
                         newPgrp:newPgrp
@@ -1045,7 +1097,7 @@
 
     "/ nil those references here, because there is still a home-context reference from the
     "/ monitor-pid action block. Otheriwse, the garbage collector might not collect them.
-    externalInStream := externalAuxStream := externalOutStream := externalErrorStream := nil.
+    externalInStream := externalAuxInStream := externalAuxOutStream := externalOutStream := externalErrorStream := nil.
     
     pid isNil ifTrue:[
         UserPreferences current logExecutedOSCommands ifTrue:[