#!/bin/bash
env_file () {
   env=${1:-.env}
   [[ -f "${env}" ]] && { echo $env; return 0; } # || echo not $env
   [[ -f "${env}.env" ]] && { echo "${env}.env"; return 0; } # || echo not ${env}.env
   [[ -f "${env}/.env" ]] && { echo "${env}/.env"; return 0; } # || echo not ${env}/.env
   return 1
}  

# # if script was executed then call the function
(return 0 2>/dev/null) || env_file $@