Plumb 介绍
Plumb 是一个操作系统的 Shell 侧重于 Pipes：
instead of pipelines, it can build large graphs of processes (nodes) and pipes
(edges). Pipes are simple unidirectional streams without side effects. Traffic
can be controlled by virtual processes (which are nodes just like real
processes, but are implemented in plumb for minimal overhead). Virtual
processes can split, merge, regex filter/alter, and shape the streams. Timers
and starting/stopping processes or even rewiring the script on the fly are
also supported.
Plumb 是可移植的项目，可运行在 Linux, Windows, Mac OS X, 很多 BSD 变种和一些老的 UNIX 系统。