diff --git a/site_ansto/instrument/util/gen_sct.py b/site_ansto/instrument/util/gen_sct.py
index 656c4316..f459dd59 100755
--- a/site_ansto/instrument/util/gen_sct.py
+++ b/site_ansto/instrument/util/gen_sct.py
@@ -33,14 +33,6 @@ import os
 import ply.lex as lex
 import ply.yacc as yacc
 
-global Verbose
-global DriverDump
-global CodeDump
-global FunctionTypes
-global DriveableFunctionTypes
-global NumberOfLinesIn
-global NumberOfLinesOut
-
 states = (
     ('tcl', 'exclusive'),
     )
@@ -63,11 +55,33 @@ DriveableFunctionTypes = [
 Verbose = False
 DriverDump = False
 CodeDump = False
+PrintedFileName = -1
+NumberOfLinesIn = 0
+NumberOfLinesOut = 0
+SourceFileList = []
+SourceLineList = []
 
 def PrintParseError(message):
+    global PrintedFileName
+    global lexer
+    global SourceData
+    curr_line = lexer.lineno
+    curr_file = SourceLineList[curr_line - 1][0]
+    if curr_file != PrintedFileName:
+        PrintedFileName = curr_file
+        SourceFile = SourceFileList[curr_file]
+        print "in", SourceFile
     print message
+    print "%4d:" % SourceLineList[curr_line - 1][1], SourceData[curr_line - 1]
 
 def PrintPostError(message):
+    global PrintedFileName
+    global SourceLineList
+    curr_file = 0
+    if curr_file != PrintedFileName:
+        PrintedFileName = curr_file
+        SourceFile = SourceFileList[curr_file]
+        print "in", SourceFile
     print message
 
 #
@@ -1783,11 +1797,46 @@ def process_drivers(TheDrivers):
             dump_driver(MyDriver)
         generate_driver(MyDriver)
 
+def load_file(source_file, depth_list):
+    global SourceFileList, SourceLineList
+    # find the file and set the name
+    SourceFile =  os.path.realpath(os.path.abspath(source_file))
+    if not os.path.isfile(SourceFile):
+        #print source_file, SourceFile, SourceFileList
+        if len(SourceFileList) > 0:
+            trial_name = os.path.join(os.path.dirname(SourceFileList[0]), source_file)
+            #print trial_name
+            if os.path.isfile(trial_name):
+                SourceFile =  os.path.realpath(os.path.abspath(trial_name))
+    SourceFileList.append(SourceFile)
+    curr_file = len(SourceFileList) - 1
+    fd = open(SourceFile, 'r')
+    LocalData = []
+    line_no = 0
+    for line in fd:
+        line_no += 1
+        line = line.rstrip('\n')
+        LocalData.append(line)
+        SourceLineList.append((curr_file, line_no))
+    fd.close()
+    return LocalData
+
+def dump_source_files(data):
+    print "SourceFileList:", SourceFileList
+    print "SourceLineList:", SourceLineList
+    curr_file = -1
+    for line_no, line in enumerate(data):
+        if SourceLineList[line_no][0] != curr_file:
+            curr_file = SourceLineList[line_no][0]
+            print "File:", SourceFileList[curr_file]
+        print "%4d:" % SourceLineList[line_no][1], line
+
 def process_source(source_files):
     global lexer, yaccer
-    global PathName
+    global PathName, SourceFile
     global TheDrivers
     global NumberOfLinesIn
+    global SourceData
 
     TheDrivers = {}
 
@@ -1805,12 +1854,10 @@ def process_source(source_files):
 
     for source_file in source_files:
         PathName = os.path.realpath(os.path.abspath(os.path.dirname(source_file)))
-        fd = open(source_file, 'r')
-        data = fd.read()
-        fd.close()
-        NumberOfLinesIn = data.count('\n')
+        SourceData = load_file(source_file, [])
+        NumberOfLinesIn = len(SourceData)
         start_line = lexer.lineno
-        yaccer.parse(data)
+        yaccer.parse('\n'.join(SourceData))
         stop_line = lexer.lineno
         if Verbose:
             print 'Consumed file %s with %d lines (%d, %d)' % \
@@ -1818,6 +1865,8 @@ def process_source(source_files):
         lexer.lineno = 1
 
     process_drivers(TheDrivers)
+    if args.list:
+        dump_source_files(SourceData)
 
 def main():
     global Verbose
@@ -1832,6 +1881,8 @@ def main():
         action="store_true")
     parser.add_argument("-d", "--driver", help="dump driver",
         action="store_true")
+    parser.add_argument("-l", "--list", help="list output",
+        action="store_true")
     parser.add_argument("-m", "--move", help="generate move commands",
         action="store_true")
     parser.add_argument("-v", "--verbose", help="verbose output",