diff --git a/configtool.py b/configtool.py
index 6f2d8bd..800537a 100755
--- a/configtool.py
+++ b/configtool.py
@@ -78,6 +78,14 @@ def cmdLoad(arg):
   print("Expected one of *.ini, board.*.h or printer.*.h.")
   sys.exit(2)
 
+def cmdShowAll():
+  names = {"configtool": getSettings(), "board": board, "printer": printer}
+  for namespace in names:
+    if names[namespace]:
+      values = names[namespace].getValues()
+      for k in sorted(values):
+        print("%s.%s: %s" % (namespace, k, str(values[k])))
+
 def cmdHelp():
   print("""Usage: %s [options]
 
@@ -96,6 +104,8 @@ Following options are available for command line automation:
                               Content of this file is valid before the GUI
                               loads, only. GUI will overwrite them with the
                               files found in config.h.
+
+  -a, --show-all              Show all loaded variables and values.
 """ % sys.argv[0])
 
 def CommandLine(argv):
@@ -106,7 +116,8 @@ def CommandLine(argv):
   global settings, verbose
 
   try:
-    opts, args = getopt.getopt(argv, "hvl:", ["help", "verbose", "load="])
+    opts, args = getopt.getopt(argv, "hvl:a", ["help", "verbose", "load=",
+                               "show-all"])
   except getopt.GetoptError as err:
     print(err)
     print("Use '%s --help' to get help with command line options." %
@@ -128,6 +139,9 @@ def CommandLine(argv):
     elif opt in ("-l", "--load"):
       cmdLoad(arg)
 
+    elif opt in ("-a", "--show-all"):
+      cmdShowAll()
+
 if __name__ == '__main__':
   CommandLine(sys.argv[1:])
   StartGui(getSettings())
diff --git a/configtool/board.py b/configtool/board.py
index a71fd15..fab8b6f 100644
--- a/configtool/board.py
+++ b/configtool/board.py
@@ -26,6 +26,12 @@ class Board:
     self.candHeatPins = []
     self.candThermPins = []
 
+  def getValues(self):
+    vars = [("sensor." + x[0], x[1:]) for x in self.sensors]
+    vars += [("heater." + x[0], x[1:]) for x in self.heaters]
+    vars += [(x, self.cfgValues[x]) for x in self.cfgValues]
+    return dict(vars)
+
   def getCPUInfo(self):
     vF_CPU = None
     if 'F_CPU' in self.cfgValues.keys():
diff --git a/configtool/printer.py b/configtool/printer.py
index 0af792a..3b289e2 100644
--- a/configtool/printer.py
+++ b/configtool/printer.py
@@ -16,6 +16,10 @@ class Printer:
     self.settings = settings
     self.cfgDir = os.path.join(self.settings.folder, "configtool")
 
+  def getValues(self):
+    vars = [(x, self.cfgValues[x]) for x in self.cfgValues]
+    return dict(vars)
+
   def hasData(self):
     return (self.configFile != None)
 
diff --git a/configtool/settings.py b/configtool/settings.py
index 1ce39a7..645770e 100644
--- a/configtool/settings.py
+++ b/configtool/settings.py
@@ -100,6 +100,22 @@ class Settings:
 
     return True
 
+  def getValues(self):
+    return {
+      "arduinodir": str(self.arduinodir),
+      "cflags": str(self.cflags),
+      "ldflags": str(self.ldflags),
+      "objcopyflags": str(self.objcopyflags),
+      "programmer": str(self.programmer),
+      "port": str(self.port),
+      "t0": str(self.t0),
+      "r1": str(self.r1),
+      "numtemps": str(self.numTemps),
+      "maxadc": str(self.maxAdc),
+      "minadc": str(self.minAdc),
+      "uploadspeed": str(self.uploadspeed)
+    }
+
   def saveSettings(self):
     self.section = "configtool"
     try: