Package script provides helper functions to write scripts. Inspired by https://github.com/bitfield/script, with some improvements: * Output between streamed commands is a stream and not loaded to memory. * Better representation and handling of errors. * Proper incocation, usage and handling of stderr of custom commands. The script chain is represented by a (`Stream`) https://godoc.org/github.com/posener/script#Stream object. While each command in the stream is abstracted by the (`Command`) https://godoc.org/github.com/posener/script#Command struct. This library provides basic functionality, but can be extended freely. A simple "hello world" example that creats a stream and pipe it to the stdout. An example that shows how to iterate scanned lines. An example that shows how to create custom commands using the `Through` method with a `PipeFn` function.