Please note: Topics asking for support with how to get specific languages to build or execute outside of Atom are off-topic for this forum and will be closed. You may want to refer to Stack Overflow for specific questions.
- Launch Atom
- Select the menu
View > Developer > Toggle Developer Tools
- Click the "Console" tab
If you want to build code or execute scripts from within Atom there are a number of packages available including:
Resources on getting started with languages that are commonly asked about: