Enable or disable ENV variables.

setEnv.sh

#!/bin/bash

# . script.sh     # identical to "source script.sh"
if [ $# -eq 0 ]
  then
    echo "No arguments supplied"
fi
if [ $# -eq 1 ]
then
	if [[ "$1" = "--set" ]]
	then
		echo "foo is set"
		export NO_PROXY=localhost,127.0.0.0/8,::1
		export ALL_PROXY=socks://proxy.foo.it:8080/
		export HTTP_PROXY=http://proxy.foo.it:8080/
		export HTTPS_PROXY=https://proxy.foo.it:8080/
		export FTP_PROXY=ftp://proxy.foo.it:8080/
		export SOCK_PROXY=socks://proxy.foo.it:8080/
	fi
	if [[ "$1" = "--unset" ]]
	then
	echo "foo is unset"
		export NO_PROXY=localhost,127.0.0.0/8,::1
		unset ALL_PROXY
		unset HTTP_PROXY
		unset HTTPS_PROXY
		unset FTP_PROXY
		unset SOCK_PROXY
	fi
else
	echo "Usage $0 [--set | --unset]"
fi