How use and run Swift 2.3 on command line

Question

How do you start Swift on the command line? And how do you compile files on the command line with Swift 2.3? Since I updated to Xcode 8 I get Swift 3 by default.

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Answer 1

UPDATE

To use Swift 2.3 prefix swift with toolchain selection via xcrun:

xcrun --toolchain "com.apple.dt.toolchain.Swift_2_3" swift --version

prints:

Apple Swift version 2.3 (swiftlang-800.10.12 clang-800.0.38)
Target: x86_64-apple-macosx10.9

OLD ANSWER

Use swiftenv to install and switch between Swift versions.

Install using Homebrew:

brew install kylef/formulae/swiftenv

Configure environment (zsh, for example):

echo 'if which swiftenv > /dev/null; then eval "$(swiftenv init -)"; fi' >> ~/.zshrc

List available versions:

swiftenv install --list

Install Swift 2.2:

swiftenv install 2.2