direnv

Дополняет существующие оболочки новой функцией, которая может загружать и выгружать переменные среды в зависимости от текущего каталога.

$ apt install direnv
echo "eval \"$(direnv hook bash)\"" >> ~/.bashrc

$ # Create a new folder for demo purposes.
$ mkdir ~/my-project
$ cd ~/my-project
 
# Show that the FOO environment variable is not loaded.
$ echo ${FOO-nope}
nope
 
# Create a new .envrc. This file is bash code that is going to be loaded by
# direnv.
$ echo export FOO=foo > .envrc
.envrc is not allowed
 
# The security mechanism didn't allow to load the .envrc. Since we trust it,
# let's allow its execution.
$ direnv allow .
direnv: reloading
direnv: loading .envrc
direnv export: +FOO
 
# Show that the FOO environment variable is loaded.
$ echo ${FOO-nope}
foo
 
# Exit the project
$ cd ..
direnv: unloading
 
# And now FOO is unset again
$ echo ${FOO-nope}
nope