How to automatically load and unload .env file with variables

Is it possible to load an .env file when accessing the directory they are in and unload these variables when changing to another directory?

With zsh:

: ${ZSH_DOTENV_FILE:=".env"}

#
# Source local '.env' file (if any).
#
source_env_file() {
  if [[ -f "${ZSH_DOTENV_FILE}" ]]; then
    >&2 echo "Auto-sourcing ${ZSH_DOTENV_FILE} file"
    source "${ZSH_DOTENV_FILE}"
  fi
}

# Hook our function so that it gets automatically executed whenever we `cd`
# See special `chpwd` hook function: https://zsh.sourceforge.io/Doc/Release/Functions.html
autoload -U add-zsh-hook
add-zsh-hook chpwd source_env_file

If you use the ohmyzsh framework, then you could also use this plugin: dotenv (which essentially does the same).

Yes with bash.. This will change directory to the specified directory as normal and if a .env file exists there it will source it. If you add this snippet to your users .bashrc and source it.

function cd() {
    new_directory="$*";
    if [ $# -eq 0 ]; then
        new_directory=${HOME};
    fi;
    builtin cd "${new_directory}"

    if [ -f .env ];
    then
        source .env
    fi
}

If you want load .env while opening a new tab

function loadenv() {
    if [ -f .env ];
    then
        source .env
    fi  
}

loadenv

function cd() {
    builtin cd $@
    loadenv                                                                                                                                                            
}