I use "_eof_" (EOF is short for "End Of File") because it is traditional, but you can use anything, as long as it does not conflict with a bash reserved word.
我使用“ _ E OF _ ” (EOF表示文件的末尾)，是因为，这是一个传统的表示形式，但是，你可以使用任何字符穿，只要你所用的字符串不跟bash的保留字相冲突就可以了。
When all the data have been written, set the eof (end-of-file) argument.
当所有数据全部写入之后，就需要设置eof(文件结束参数)。
It returns NULL, defined in stdio.h, for either error or EOF [end-of-file]; after the loop, we check for which one occurred.
对于错误或EOF[文件结束]，它都返回NULL，这是在stdio . h中定义的；循环结束后，我们会检查究竟是哪种情况。
Choice eof the end covers choice of the means.
选择目的包含著选择手段。
We are not able to push back EOF. But when we've reached the end of the file, we can push back a character.
我们不能推回一个EOF，但是当我们到达文件的结尾时，我们可以推回一个字符。
CE_RXOVER An input buffer overflow has occurred. There is either no room in the input buffer, or a character was received after the end-of-file (EOF) character.
接收缓冲区发生溢出错误。接收缓冲区没有足够的空间，或者有字符出现在了EOF字符后。
CE_RXOVER An input buffer overflow has occurred. There is either no room in the input buffer, or a character was received after the end-of-file (EOF) character.
接收缓冲区发生溢出错误。接收缓冲区没有足够的空间，或者有字符出现在了EOF字符后。
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