即变量名参数等是大小写字母敏感的。

But the parameters and variables are case sensitive.

youdao

通常，如果指定了文件名参数，则程序把它作为输入。

Typically, if a filename argument is specified, the program takes that as its input.

youdao

如果命令行上没有给出文件名参数，我们就使用标准输入。

If a filename arg was not given on the command line, we use stdin.

youdao

So all of these programs or commands that we've been using thus far for the piece set in class, take what we call command line arguments, they are the zero or more words that follow the program's name.

所有我们一直在课堂上使用的,这些程序或者命令，携带着命令行参数，它们是跟在,程序名的后面的一个或多个单词。

哈佛公开课 - 计算机科学课程节选

But this choice of names, both for my functions and also for my parameters or my variables is completely up to me.

但是这个名字的选择，包括我的函数名,和我的参数名,或者变量名都是我定义的。

哈佛公开课 - 计算机科学课程节选