Anonymous UNIX pipe type in rust.
```rust use apipe::CommandPipe;
fn main() {
let mut pipe = CommandPipe::new();
pipe.add_command("echo")
.arg("This is a test.")
.add_command("grep")
.arg("-Eo")
.arg(r"\w\w\sa[^.]*")
.spawn()
.expect("Failed to spawn pipe.");
let output = pipe.output().unwrap().stdout.as_slice();
assert_eq!(&String::from_utf8_lossy(output), "is a test\n");
} ```