A quick little script for verifying Git, VirtualBox and Vagrant are installed.

system-check.sh

#!/bin/bash

command -v git >/dev/null 2>&1 && echo "Git is installed" || { echo >&2 "I require git but it's not installed. Please download it from http://git-scm.com/"; exit 1; }
command -v VBoxManage >/dev/null 2>&1 && echo "VirtualBox is installed" || { echo >&2 "I require VBoxManage but it's not installed. Please download it from https://www.virtualbox.org/"; exit 1; }
command -v vagrant >/dev/null 2>&1 && echo "Vagrant is installed" || { echo >&2 "I require vagrant but it's not installed. Please download it from http://www.vagrantup.com/"; exit 1; }