tldr/pages/common/crystal.md

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# crystal
> 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}}`
- 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`