Install specific version of Homebrew formula

gistfile1.sh

brew update
brew versions FORMULA
cd `brew --prefix`
git checkout HASH Library/Formula/FORMULA.rb  # use output of "brew versions"
brew install FORMULA
brew switch FORMULA VERSION
git checkout -- Library/Formula/FORMULA.rb    # reset formula

## Example: Using Subversion 1.6.17
#
# $ brew versions subversion
# 1.7.3    git checkout f8bf2f3 /usr/local/Library/Formula/subversion.rb
# 1.7.2    git checkout d89bf83 /usr/local/Library/Formula/subversion.rb
# 1.6.17   git checkout 6e2d550 /usr/local/Library/Formula/subversion.rb
# 1.6.16   git checkout 83ed494 /usr/local/Library/Formula/subversion.rb
# 1.6.15   git checkout 809a18a /usr/local/Library/Formula/subversion.rb
# 1.6.13   git checkout 7871a99 /usr/local/Library/Formula/subversion.rb
# 1.6.12   git checkout c99b3ac /usr/local/Library/Formula/subversion.rb
# 1.6.6    git checkout 8774131 /usr/local/Library/Formula/subversion.rb
# 1.6.5    git checkout a82e823 /usr/local/Library/Formula/subversion.rb
# 1.6.3    git checkout 6b6d369 /usr/local/Library/Formula/subversion.rb
# $ cd `brew --prefix`
# $ git checkout 6e2d550 /usr/local/Library/Formula/subversion.rb
# $ brew install subversion
# $ brew switch subversion 1.6.17
# $ git checkout -- Library/Formula/subversion.rb

I created a function version https://gist.github.com/rainchen/6363948
usage example:
$ brew-install ssh-copy-id 6.0p1

Works perfectly! Thx!

When trying to install subversion 1.7.x, I got "Error: No available formula for serf". The workaround was:

$ brew tap homebrew/versions
$ brew install subversion17

as mentioned here. To switch back and forth between the two, you can use brew unlink and brew link.

There is no brew versions command.

The brew versions command has been completely deprecated, and the tap has been drained.