added batch support to console and attach actions

cmd/geth/js.go

@@ -220,6 +220,25 @@ func (self *jsre) loadAutoCompletion() {
 	}
 }
 
+func (self *jsre) batch(statement string) {
+	val, err := self.re.Run(statement)
+
+	if err != nil {
+		fmt.Printf("error: %v", err)
+	} else if val.IsDefined() && val.IsObject() {
+		obj, _ := self.re.Get("ret_result")
+		fmt.Printf("%v", obj)
+	} else if val.IsDefined() {
+		fmt.Printf("%v", val)
+	}
+
+	if self.atexit != nil {
+		self.atexit()
+	}
+
+	self.re.Stop(false)
+}
+
 // show summary of current geth instance
 func (self *jsre) welcome() {
 	self.re.Eval(`console.log('instance: ' + web3.version.client);`)