Install Groovy on Windows

1. Go here http://groovy-lang.org/download.html

2. Click Windows Installer and click next a bunch of times until it is installed.

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Install Groovy on Ubuntu 20.04

Install Open JDK

Install OpenJDK 14 version sudo apt install openjdk-14-jdk* sudo apt install openjdk-14-jre*

edit your .bashrc file vi ~/.bashrc add the following 2 lines to the end of the file

export JAVA_HOME=/usr/lib/jvm/java-14-openjdk-amd64/
export PATH=$JAVA_HOME/bin:$PATH

Source .bashrc so changes take effect source ~/.bashrc

Install Groovy 3.x

sudo snap install groovy --classic

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Install Groovy on Mac

1. Update Java to at least Java 7 in the System Preferences Java Control Panel

2. Type in Terminal /usr/libexec/java_home -V to get something like 1.7.0_55, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_55.jdk/Contents/Home

3. Type in terminal export JAVA_HOME=/usr/libexec/java_home -v 1.7.0_55, x86_64

4. Type in terminal java -version and make sure you have at least Java 7

5. Install HomeBrew at http://brew.sh/

6. Type in terminal brew install groovy

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Update Atom for Groovy

In Atom Open Command Palette -> Install Packages Themes -> Type language-groovy and install

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Run Groovy code

Groovy files have the extension .groovy. You can run a groovy file at the terminal with: groovy myfile.groovy