Don't worry! It's only stuff...

export http_proxy=http://10.203.0.1:5187/
export https_proxy=$http_proxy
export ftp_proxy=$http_proxy
export rsync_proxy=$http_proxy
export no_proxy="localhost,127.0.0.1,localaddress,.localdomain.com"

cat <> /etc/environment
export http_proxy="http://${PROXY_USER}:${PROXY_PASS}@192.168.0.222:8080"
export https_proxy="http://${PROXY_USER}:${PROXY_PASS}@192.168.0.222:8080"
export no_proxy="localhost,127.0.0.1,foo.example.com"
EOF

cat < /etc/apt/apt.conf.d/12proxy
Acquire::http::Proxy "http://${PROXY_USER}:${PROXY_PASS}@192.168.0.222:8080";
Acquire::https::Proxy "http://${PROXY_USER}:${PROXY_PASS}@192.168.0.222:8080";
EOF