在上面这个例子中，cat命令从它自身的标准输入处，接受了从脚本文件中传递过来的输入字符流。

In the case of the script above, the cat command was given a stream of input from our script to its standard input.

youdao

否则，将原来的字符放到输出流中，并且将输入流重置到原始位置。

Otherwise, the original character is placed in the output stream, and the input stream is reset to the original position.

youdao

因为流输入来自字符数组，也就没有实际的限制，因此该参数会被忽略。

Because the stream's input comes from a character array, there is no actual limit; hence this argument is ignored.

youdao

因为流输入来自字符数组，也就没有实际的限制，因此该参数会被忽略。

Because the stream's input comes from a character array, there is no actual limit; hence this argument is ignored.

youdao