Index: setupCAN/setupVCAN.sh
===================================================================
diff -u -r5534b56f246b0597a37f08f145f4d61ae8340e4d -rc28bb75d80a72b195cbe5625ff302aab40f04aeb
--- setupCAN/setupVCAN.sh	(.../setupVCAN.sh)	(revision 5534b56f246b0597a37f08f145f4d61ae8340e4d)
+++ setupCAN/setupVCAN.sh	(.../setupVCAN.sh)	(revision c28bb75d80a72b195cbe5625ff302aab40f04aeb)
@@ -1,8 +1,23 @@
 #!/bin/bash
+
 CAN=can0
 if [ "$1" != "" ]; then
     CAN=$1
 fi
-sudo modprobe vcan
-sudo ip link add dev $CAN type vcan
-sudo ip link set $CAN up
+
+function canbusExists() {
+    if [ -z "$(ip link | grep $CAN)" ]; then
+        echo 0
+    else
+        echo 1
+    fi
+}
+
+if [ $(canbusExists) -eq 0 ]; then
+    sudo modprobe vcan
+    sudo ip link add dev $CAN type vcan
+    sudo ip link set $CAN up
+fi
+
+echo $(canbusExists)
+