Rubish: A Unix shell written in pure Ruby

Rubish is a Unix shell written in pure Ruby that parses shell syntax and compiles it to Ruby code for execution. It maintains full Bash compatibility while deeply integrating Ruby features, allowing users to seamlessly mix shell commands with Ruby code, including blocks, iterators, and method chaining syntax. The shell can be installed via Homebrew or from source and supports both traditional Unix-style commands and Ruby method call syntax.