`aztec-up` can be used to manage multiple versions.

```
$ aztec-up
aztec-up - Aztec version manager

Usage: aztec-up [command] [options]

Commands:
  install <version>         Install a version and switch to it
  use [<version>]           Switch to an installed version (or read from .aztecrc)
  list                      List installed versions
  uninstall <version>       Remove an installed version
  self-update               Update aztec-up itself to the latest version

Options:
  -h, --help                Show this help message

Examples:
  aztec-up install          Install the latest version
  aztec-up install nightly  Install the latest nightly version
  aztec-up install 0.85.0   Install a specific version
  aztec-up use 0.85.0       Switch to version 0.85.0
  aztec-up use              Read version from .aztecrc and switch to it
  aztec-up list             Show all installed versions
  aztec-up self-update      Update aztec-up to latest
```

If a `.aztecrc` file is present in the cwd, `aztec` will automatically switch to that version in that run context.

```
t % aztec --version
0.0.1-commit.1142ef1
t % cd fooproj
t % cat .aztecrc
0.0.1-commit.6d3c34e
t % aztec --version
0.0.1-commit.6d3c34e
t %
```

# Testing

You can install `aztec-up` with:
```
VERSION=0.0.1-commit.6d3c34e bash -i <(curl -s https://install.aztec.network/0.0.1-commit.6d3c34e/aztec-install)
```

At present you can't list available remote versions. The code does currently support listing available remote aliases, but they're not deployed yet. You can install another version with e.g.
```
aztec-up install 0.0.1-commit.1142ef1
```

Then list versions with:

```
t % aztec-up list
Installed versions:

* 0.0.1-commit.1142ef1 (current)
  0.0.1-commit.6d3c34e

Aliases:
  (could not fetch aliases)
```