I have a strange issue where the bash code I put into Vagrantfile and run 
with 'provision' gives different output than if I copy/paste the exact same 
code into the shell of the vagrant machine. 

Here's a stripped down version of my Vagrantfile I've gotten to prove this 
strange issue. 

# -*- mode: ruby -*-
# vi: set ft=ruby :

$test_apt = <<-SCRIPT
  #!/usr/bin/env bash

  dpkg_find() {
    pkgname="$1"
    echo "in dpkg_find, pkgname=${pkgname}" 
      dpkg --get-selections | egrep "${pkgname}"'\s+install' && {
      echo "FOUND"
    } || {
      echo "NOT_FOUND"
    }
  }

  dpkg_find vim
SCRIPT

Vagrant.configure("2") do |config|
  config.vm.box = "peru/ubuntu-18.04-desktop-amd64"
  config.vm.box_version = "20190222.03"
  config.vm.network :private_network, ip: '192.168.85.102'
   config.vm.provision "shell", inline: $test_apt
end


$ vagrant provision
==> default: Running provisioner: shell...
    default: Running: inline script
    default: in dpkg_find, pkgname=vim
    default: NOT_FOUND





I can copy paste the dpkg_find function and its call line and get different 
output!

$ vagrant ssh

vagrant@linux:~$ sudo su -
root@linux:~# dpkg_find() {
    pkgname="$1"
    echo "in dpkg_find, pkgname=${pkgname}" 
    dpkg --get-selections | egrep "${pkgname}"'\s+install' && {
      echo "FOUND"
    } || {
      echo "NOT_FOUND"
    }
  }



root@linux:~# dpkg_find vim
in dpkg_find, pkgname=vim
vim install
FOUND



What is going on here?

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