foreach行上缺少的列表并不是输入错误：如果您省略某个列表，则foreach结构将处理命令行上给出的参数列表。

The missing list on the foreach line isn't a typo: If you omit a list, the foreach structure processes the list of arguments given on the command line.

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在处理那些可用行和列表示且通过命令(比如select和jion)操作的数据时，传统的分析和数据库方法表现非常优秀。

Traditional analytics and database methods are excellent at handling data that can easily be represented in rows and columns and manipulated by commands such as select and join.

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运行 ps 命令，并将结果分配给一个列表（第 7 行到第 8 行）。

Run the ps command and assign the results to a list (lines 7-8).

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