Add a system() call to the d8 shell (Unix only).

samples/shell.cc

-// Copyright 2008 the V8 project authors. All rights reserved.
+// Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
@@ skipping 104 matching lines @@
     if (first) {
       first = false;
     } else {
       printf(" ");
     }
     v8::String::Utf8Value str(args[i]);
     const char* cstr = ToCString(str);
     printf("%s", cstr);
   }
   printf("\n");
+  fflush(stdout);
   return v8::Undefined();
 }
 
 
 // The callback that is invoked by v8 whenever the JavaScript 'load'
 // function is called.  Loads, compiles and executes its argument
 // JavaScript file.
 v8::Handle<v8::Value> Load(const v8::Arguments& args) {
   for (int i = 0; i < args.Length(); i++) {
     v8::HandleScope handle_scope;
@@ skipping 128 matching lines @@
     for (int i = 0; i < start; i++) {
       printf(" ");
     }
     int end = message->GetEndColumn();
     for (int i = start; i < end; i++) {
       printf("^");
     }
     printf("\n");
   }
 }