Install apt packages on multiple computers simultaneously

install-apt-packages.sh

#!/bin/bash

# Dependencies:
# - Each machine must have openssh-server installed
# - Each machine must have key-based SSH authentication configured
# - Each machine must have 

declare -a MACHINES=(
  "localhost"
  "nonexistent"
  "tobys-machine"
  "etc"
)
PRIVILEGED_USER="stem"
PACKAGES="vim libreoffice python3"

for MACHINE in ${MACHINES[@]};
do
  echo "Installing packages on $MACHINE..."
  CMD="ssh $PRIVILEGED_USER@$MACHINE 'sudo apt-get install -y $PACKAGES'"
  exec $CMD
  echo "Finished installing packages on $MACHINE."
done