#!/bin/bash

CAN=can0
if [ "$1" != "" ]; then
    CAN=$1
fi

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)