Mac安装多版本go

brew install go

brew unlink go

brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/4ba973d04d167a990524f3d52c128c0c843d1931/Formula/go.rb

brew info go

https://github.com/Homebrew/homebrew-core/commits/master/Formula/go.rb

#GOROOT should be an existing link
GOROOT=$GOROOT
ls $GOROOT
V=$1

echo "Switching to go $V"
brew unlink go
brew switch go $V

echo "Switching GOROOT"
rm $GOROOT
ln -s /usr/local/Cellar/go/$V/libexec $GOROOT

switchgo.sh 1.9.3