Plumb是一个操作系统的Shell侧重于Pipes：
insteadofpipelines,itcanbuildlargegraphsofprocesses(nodes)andpipes(edges).Pipesaresimpleunidirectionalstreamswithoutsideeffects.Trafficcanbecontrolledbyvirtualprocesses(whicharenodesjustlikerealprocesses,butareimplementedinplumbforminimaloverhead).Virtualprocessescansplit,merge,regexfilter/alter,andshapethestreams.Timersandstarting/stoppingprocessesorevenrewiringthescriptontheflyarealsosupported.
Plumb是可移植的项目，可运行在Linux,Windows,MacOSX,很多BSD变种和一些老的UNIX系统。
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