Tool for managing Crystal source code. More information: <https://crystal-lang.org/reference/using_the_compiler>.

• Run a Crystal file:
  crystal path/to/file.cr
• Compile a file and all dependencies to a single executable:
  crystal build path/to/file.cr
• Read Crystal source code from the command line or `stdin`, and execute it:
  crystal eval 'code'
• Generate API documentation from inline docstrings in Crystal files:
  crystal docs
• Compile and run a Crystal specification suite:
  crystal spec
• Start a local interactive server for testing the language:
  crystal play
• Create a project directory for a Crystal application:
  crystal init app application_name
• Display all help options:
  crystal help

© tl;dr; authors and contributors