Most of the Clojure tutorials and Clojure examples on this site require at the minimum Clojure to be installed. Usually, you want Leiningen installed too.
Seriously, do it once and ignore it for the rest of your learning experience. Here are the steps for getting Lein and Clojure up and running.
Step 1: Make sure you have a Java JDK on your computer. I recommend Adopt Open JDK. They have Java JDK installers for all major operating systems, including Linux.
Step 2.1: For extra credit, put lein in your command path. This will very based off your preferences and OS. On *nix this might be in ~/bin/ . On windows, you might might just add the full path to your lein script to the environment variable $PATH .
Step 3: Make lein executable. You need to change permissions so that you can use the command lein from the command line. (Little Clojure humor there.) On Linux and MacOS use the command chmod a+x <full path>/lien On Windows, the lein.bat is probably already executable. If the lein.bat file is not running when you type lein , check to see if there is a hidden .txt extension appended on to lein.bat .
Step 4: Run the lein command to let lein self-install Clojure and the newest version of Leiningen.
A quick note for Linux users and MacOS users, you may need to use sudo at some point in the installation process, but running lein when you are done should not require the use of sudo .
Once lein is installed, type lein repl to get a Clojure REPL up and running for quick use of Clojure.