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。
