Install Crystal

sh install.sh

How to build

crystal build hello_world.cr

or build for release

crystal build hello_world.cr --release

Some Crystal commands

crystal init: generate a new project
crystal build: build an executable
crystal docs: generate documentation
crystal env: print Crystal environment information
crystal eval: eval code from args or standard input
crystal play: starts crystal playground server
crystal run: build and run program
crystal spec: build and run specs
crystal tool: run a compiler tool
crystal help: show help about commands and options
crystal version: show version