Added Massimo's Serial command line example

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diff --git a/libraries/Bridge/examples/YunSerialTerminal/YunSerialTerminal.ino b/libraries/Bridge/examples/YunSerialTerminal/YunSerialTerminal.ino
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+++ b/libraries/Bridge/examples/YunSerialTerminal/YunSerialTerminal.ino
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+
+/*
+  Arduino Yun USB-to-Serial
+ 
+ Allows you to use the Yun's 32U4 processor as a
+ serial terminal for the linino processor
+ 
+ Upload this to an Arduino Yun via serial (not WiFi) 
+ then open the serial monitor at 115200 to see the boot process
+ of the linino processor. You can also use the serial monitor
+ as a basic command line interface for the linino processor using 
+ this sketch.
+ 
+ The circuit:
+ * Arduino Yun
+ 
+ created March 2013
+ by Massimo Banzi
+ 
+ This example code is in the public domain.
+ */
+
+long baud = 115200;
+
+// Pin 13 has an LED connected on most Arduino boards.
+// give it a name:
+int led = 13;
+int ledState = HIGH;   // whether the LED is high or low      
+
+
+void setup() {
+  Serial.begin(baud);        // open serial connection to Linino
+  Serial1.begin(baud);       // open serial connection via USB-Serial
+  Serial.println("Prova");   // Hello USB
+  Serial1.println("Prova1"); // Hello Linino
+
+  // initialize the digital pin as an output.
+  pinMode(led, OUTPUT);    
+  digitalWrite(led, ledState);   // turn the LED on (HIGH is the voltage level)
+}
+
+
+void loop() {
+
+  // copy from virtual serial line to uart and vice versa
+  if (Serial.available()) {           // got anything from USB-Serial?
+    char c = (char)Serial.read();     // read from USB-serial
+    Serial1.write(c);                 // write to Linino
+    ledState=!ledState;               // invert LED state
+    digitalWrite(led, ledState);      // toggle the LED
+  }
+  if (Serial1.available()) {          // got anything from Linino?         
+    char c = (char)Serial1.read();    // read from Linino  
+    Serial.write(c);                  // write to USB-serial
+  }
+}
+
+
+
+
+