We've briefly touched upon inline scripts, but there are more options available that can be added into the configuration for provisioning.

You can run a script inline using the following syntax:

config.vm.provision "shell", inline: "sudo apt-get update -y && echo updating finished"

Or you could create a variable outside the block and use that variable for a cleaner and easier-to-read format:

$shellscript = <<-SCRIPT
 sudo apt-get update -y
 echo updating finished
 SCRIPT

config.vm.provision "shell", inline: $shellscript

You can experiment with both options and see what works best for you. You may find that, when working on a development team, they already have a syntax you must follow when creating and editing Vagrantfiles.