diff -ru kicad.orig/common/confirm.cpp kicad/common/confirm.cpp
--- kicad.orig/common/confirm.cpp	2012-01-02 15:12:29.461843000 +0100
+++ kicad/common/confirm.cpp	2012-01-04 00:59:04.412020890 +0100
@@ -9,11 +9,18 @@
 #include "wx/html/htmlwin.h"
 #include "html_messagebox.h"
 
+bool g_CmdLineMode = false;
 
 void DisplayError( wxWindow* parent, const wxString& text, int displaytime )
 {
     wxMessageDialog* dialog;
 
+    if (g_CmdLineMode)
+    {
+        wxFprintf( stderr, text + _( "\n" ) );
+        return;
+    }
+
     if( displaytime > 0 )
         dialog = new wxMessageDialog( parent, text, _( "Warning" ),
                                       wxOK | wxCENTRE | wxICON_INFORMATION );
@@ -30,6 +37,12 @@
 {
     wxMessageDialog* dialog;
 
+    if (g_CmdLineMode)
+    {
+        wxPrintf( text + _( "\n" ) );
+        return;
+    }
+
     dialog = new wxMessageDialog( parent, text, _( "Info:" ),
                                   wxOK | wxCENTRE | wxICON_INFORMATION );
 
@@ -41,6 +54,12 @@
 void DisplayHtmlInfoMessage( wxWindow* parent, const wxString& title,
                              const wxString& text, const wxSize& size )
 {
+    if (g_CmdLineMode)
+    {
+        wxPrintf( title + _( "\n" ) + text + _( "\n" ) );
+        return;
+    }
+
     HTML_MESSAGE_BOX *dlg = new HTML_MESSAGE_BOX(parent,title, wxDefaultPosition, size );
     dlg->AddHTML_Text( text );
     dlg->ShowModal();
diff -ru kicad.orig/common/edaappl.cpp kicad/common/edaappl.cpp
--- kicad.orig/common/edaappl.cpp	2012-01-02 15:12:29.461843000 +0100
+++ kicad/common/edaappl.cpp	2012-01-04 00:58:45.466217466 +0100
@@ -306,6 +306,7 @@
     wxString EnvLang;
 
     m_Id = aId;
+if (!g_CmdLineMode)
     m_Checker = new wxSingleInstanceChecker( aName.Lower() + wxT( "-" ) + wxGetUserId() );
 
     /* Init KiCad environment
diff -ru kicad.orig/include/appl_wxstruct.h kicad/include/appl_wxstruct.h
--- kicad.orig/include/appl_wxstruct.h	2012-01-02 15:12:29.461843000 +0100
+++ kicad/include/appl_wxstruct.h	2012-01-04 00:58:00.447684901 +0100
@@ -52,6 +52,7 @@
 class wxSingleInstanceChecker;
 class wxHtmlHelpController;
 
+extern bool g_CmdLineMode;
 
 /**
  * Class EDA_APP
@@ -185,6 +186,8 @@
      */
     void InitEDA_Appl( const wxString& aName, EDA_APP_T aId = APP_UNKNOWN_T );
 
+    virtual int OnRun() { return g_CmdLineMode ? 0 : wxApp::OnRun(); }
+
     /**
      * Function SetLanguage
      * sets the dictionary file name for internationalization.
diff -ru kicad.orig/include/wxEeschemaStruct.h kicad/include/wxEeschemaStruct.h
--- kicad.orig/include/wxEeschemaStruct.h	2012-01-02 15:12:29.461843000 +0100
+++ kicad/include/wxEeschemaStruct.h	2012-01-04 02:04:17.560214904 +0100
@@ -585,6 +585,8 @@
     void SVG_Print( wxCommandEvent& event );
 
     // Plot functions:
+    void CmdLineToPlot_PS( bool PlotBW, bool PlotSheetRef );
+    void CmdLineToPlot_DXF( bool PlotBW, bool PlotSheetRef );
     void ToPlot_PS( wxCommandEvent& event );
     void ToPlot_HPGL( wxCommandEvent& event );
     void ToPlot_DXF( wxCommandEvent& event );
diff -ru kicad.orig/include/wxPcbStruct.h kicad/include/wxPcbStruct.h
--- kicad.orig/include/wxPcbStruct.h	2012-01-02 15:12:29.461843000 +0100
+++ kicad/include/wxPcbStruct.h	2012-01-10 17:49:51.848114042 +0100
@@ -75,6 +75,7 @@
 class PCB_EDIT_FRAME : public PCB_BASE_FRAME
 {
     friend class PCB_LAYER_WIDGET;
+    friend bool Pcbnew_CmdLine();
 
     void updateTraceWidthSelectBox();
     void updateViaSizeSelectBox();