Add output file name to CLI.

DRAMSys/traceAnalyzer/scripts/vcdExport.py

@@ -275,8 +275,12 @@ def dumpVcd(pathToTrace):
         return f.read()
 
 if __name__ == "__main__":
-    if len(sys.argv) < 2:
-        print("Usage:", sys.argv[0], "<tracefile>")
-    else:
+    if len(sys.argv) == 2:
         dump = dumpVcd(sys.argv[1])
         print(dump)
+    elif len(sys.argv) == 3:
+        dump = dumpVcd(sys.argv[1])
+        with open(sys.argv[2], 'x') as outputFile:
+            outputFile.write(dump)
+    else:
+        print("Usage: ", sys.argv[0], "<trace_file> [output_file_name]")