每个UNIX命令都非常简单并且目标明确；将它们串在一起可以产生复杂操作。
Each UNIX command is very simple and targeted; complex actions are produced by stringing them together.
这个简单的应用程序范例定义了两个非常有用的操作，把输入的字符串转化成大写或小写。
This simple example application defines two eminently useful operations that convert input strings either to upper or lower case.
相反，连接字符串操作非常简单，只是运行一个操作码，将一个字符串变量附加到一个现有的字符串变量中即可。
In contrast, concatenating a string is pretty much just a case of running a single opcode to append a string variable to an existing string variable.
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