This little shell function allows to set environment variables when you cd into that directory.

set_enviroment_variable_per_dir_in_bash.sh

# Note: this is just a fragment that you should put in your ~/.bash_profile
# Tested on Mac only!
#
# If you want a more sophisticated and feature rich solution here are some pointers:
# - https://github.com/cxreg/smartcd
# - http://swapoff.org/ondir.html

function cd_ {
        if [ -e .env_off ] ; then
                . .env_off
        fi
        builtin cd "$*"
        if [ -e .env ] ; then
                . .env
        fi
}

alias cd=cd_