#!/bin/bash
#This script is executed every time your instance is spawned.

# check/set background every time bash starts
cat <<EOF >>$HOME/.bashrc
FILE="/usr/share/backgrounds/hackthebox.jpg"
CONF="/org/mate/desktop/background/picture-filename"
[ \$(/usr/bin/dconf read \${CONF}) != \${FILE} ] && \\
  /usr/bin/dconf write \${CONF} "'\${FILE}'"
EOF