Each command in a pipeline is executed as a separate process (i.e., in a subshell).

符号
作用,引用一段话,或许就明白了!
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For example, doctors did not have devices allowing them to go inside the human body to detect health problems or to perform delicate surgery. Repair crews did not have a way of identifying broken pipeslocated deep within a high-rise apartment building.
例如,医生没有设备允许它们在人体内检测健康问题或执行精确
外科手术。修
队没办法检查深藏在高层公寓建筑中
破裂
道。