use

use is a utility for managing project- or client-specific profile configurations. For example, maybe you have some AWS credentials for yourself, and some for work, and maybe some more for that friend you helped with that one startup thing. use lets you manage these environment-level credentials and configurations sanely.

Installation

Homebrew

brew tap justincampbell/formulae
brew install use

Package

wget -O use-latest.tar.gz https://github.com/justincampbell/use/archive/latest.tar.gz use
tar -zxvf use-latest.tar.gz
cd use-latest/
make install

Setup

Add the following to your ~/.profile:

source /usr/local/share/use/use.sh

Create a folder in ~/.use, and then add folders inside for each client:

~
  .use/
    me/
    my_company/

Then in each folder, create a .profile file to be sourced when you use that profile.

# ~/.use/me/.profile
export FOG_DIRECTORY=myname

Usage

use name # name is the directory ~/.use/name

You can also use nothing, which essentially resets your current session:

use # Same as above, but skip loading a named config.

When you use foo, the $USE environment variable will be exported with "foo", so it can be used in a PS1 or PROMPT_COMMAND:

use_prefix() {
  if [[ $USE != "" ]]; then
    echo -n "($USE) "
  fi
}
export PS1='$(use_prefix)\W$ '

Examples

AWS Configuration

# ~/.use/my_company/.profile
export AWS_ACCESS_KEY_ID=abc123
export AWS_SECRET_ACCESS_KEY=abc123