#!/bin/bash
if [ "$#" -ne 1 ] ; then
	echo "Usage: $0 <env_file>" >&2
	echo "This script read env_file variables and replace theire occurences in stdin" >&2
	exit 1
fi

bash -c 'set -a && . '"$1"' &&  envsubst "$(cat '"$1"' | grep -o ^.*= | sed "s/=//" | sed "s/^/$/")"'