Jekyll uses Rouge by default for syntax highlighting, here are some tests.

Ruby:

{% highlight ruby %}

def print_hi(name)

puts "Hi, #{name}"

end

print_hi('Tom')

#=> prints 'Hi, Tom' to STDOUT.

{% endhighlight %}

Python with line numbers:

{% highlight python linenos %}

def print_hi(name):

print("Hi, {}".format(name))

print_hi('Tom')

prints 'Hi, Tom' to STDOUT.

{% endhighlight %}

C with line numbers:

{% highlight c linenos %}

void print_hi(string name) {

printf("Hi, %s", name);

}

print_hi("Tom");

/* prints 'Hi, Tom' to STDOUT. */

{% endhighlight %}